Area Code 815 Location - Illinois
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Cities in Areacode 815
- Belvidere
- Crystal Lake
- DeKalb
- Freeport
- Joliet
- Kankakee
- Loves Park
- Machesney Park
- McHenry
- Rockford
- Romeoville
- Woodstock
| PREFIX | USAGE | PRIMARY CITY | CARRIER |
|---|---|---|---|
| 815-886- | Landline | Romeoville | Ameritech Illinois |
| 815-789- | Landline | Orangeville | Frontier North |
| 815-997- | Landline | Rockford | Mcleodusa Telecommunications Services- Il |
| 815-847- | Landline | Rockford | Sbc Internet Services |
| 815-235- | Landline | Freeport | Frontier North |
| 815-794- | Landline | Marseilles | Marseilles Telephone Co. Of Marseilles |
| 815-327- | Landline | Plainfield | Broadwing Communications |
| 815-823- | Landline | Joliet | Xo Illinois |
| 815-534- | Landline | Frankfort | Level 3 Communications |
| 815-595- | Landline | Oregon | AT&T Local |
| 815-713- | Landline | Rockford | New Cingular Wireless PCS |
| 815-645- | Landline | Stillman Valley | Frontier North |
| 815-315- | Landline | Rockford | Level 3 Communications |
| 815-456- | Landline | Franklin Grove | Frontier North |
| 815-953- | Wireless | Kankakee | Cellco Partnership DBA Verizon Wireless |
| 815-507- | Landline | Momence | Level 3 Communications |
| 815-357- | Landline | Seneca | Ameritech Illinois |
| 815-485- | Landline | New Lenox | Ameritech Illinois |
| 815-496- | Landline | Sheridan | Frontier North |
| 815-594- | Landline | Apple River | Frontier North |
| 815-585- | Landline | Morris | Level 3 Communications |
| 815-332- | Landline | Cherry Valley | Frontier North |
| 815-742- | Wireless | Rockford | United States Cellular Corp. - Illinois |
| 815-376- | Landline | Ohio | Frontier North |
| 815-681- | Landline | Rockford | Cellco Partnership DBA Verizon Wireless |
| 815-885- | Landline | Caledonia | Frontier North |
| 815-763- | Wireless | Rockford | Answer America DBA Answer Usa |
| 815-889- | Landline | Milford | Frontier Communications Of The Carolinas, Inc |
| 815-455- | Landline | Crystal Lake | Ameritech Illinois |
| 815-777- | Landline | Galena | Ameritech Illinois |
| 815-390- | Landline | Braidwood | Comcast Phone Of Illinois DBA Comco |
| 815-525- | Landline | Beloit | Tds Metrocom Inc.-il |
| 815-795- | Landline | Marseilles | Marseilles Telephone Co. Of Marseilles |
| 815-672- | Landline | Streator | Frontier North |
| 815-712- | Wireless | Harvard | Sprint Spectrum L.p. |
| 815-495- | Landline | Leland | Frontier North |
| 815-738- | Landline | Leaf River | Leaf River Telephone Co. |
| 815-547- | Landline | Belvidere | Frontier North |
| 815-825- | Landline | Malta | Frontier North |
| 815-424- | Landline | Elwood | Ameritech Illinois |
| 815-965- | Landline | Rockford | Ameritech Illinois |
| 815-203- | Wireless | Joliet | Usa Mobility Wireless |
| 815-274- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-491- | Wireless | Rockford | 365 Wireless |
| 815-218- | Wireless | Rockford | Cellco Partnership DBA Verizon Wireless |
| 815-249- | Landline | Grand Ridge | Frontier North |
| 815-365- | Landline | Reddick | Frontier North |
| 815-992- | Wireless | Streator | Sprint Spectrum L.p. |
| 815-478- | Landline | Manhattan | Ameritech Illinois |
| 815-659- | Landline | Hennepin | Frontier North |
| 815-618- | Wireless | Freeport | New Cingular Wireless PCS |
| 815-774- | Landline | Joliet | Ameritech Illinois |
| 815-710- | Landline | Morris | AT&T Local |
| 815-480- | Wireless | Rockford | Usa Mobility Wireless |
| 815-878- | Wireless | Princeton | New Cingular Wireless PCS |
| 815-297- | Landline | Freeport | Frontier North |
| 815-695- | Landline | Newark | Ameritech Illinois |
| 815-943- | Landline | Harvard | Ameritech Illinois |
| 815-337- | Landline | Woodstock | Ameritech Illinois |
| 815-280- | Landline | Joliet | Teleport Communications America |
| 815-572- | Landline | Marengo | Broadwing Communications |
| 815-338- | Landline | Woodstock | Ameritech Illinois |
| 815-862- | Landline | Harvard | Charter Fiberlink - Illinois |
| 815-309- | Landline | Shannon | Aero North Communications |
| 815-439- | Landline | Plainfield | Ameritech Illinois |
| 815-615- | Landline | Mendota | Level 3 Communications |
| 815-242- | Wireless | Rockford | Bandwidth.com Clec |
| 815-657- | Landline | Forrest | Ameritech Illinois |
| 815-558- | Wireless | Rockford | United States Cellular Corp. - Illinois |
| 815-319- | Wireless | Rockford | United States Cellular Corp. - Illinois |
| 815-782- | Landline | Plainfield | Broadwing Communications |
| 815-488- | Wireless | La Grange Park | Illinois Valley Cellular Rsa 2-i Partnership |
| 815-321- | Landline | Woodstock | Xo Illinois |
| 815-709- | Landline | Coal City | Level 3 Communications |
| 815-314- | Landline | Manhattan | Broadwing Communications |
| 815-701- | Landline | Woodstock | Level 3 Communications |
| 815-792- | Landline | Harding | Ameritech Illinois |
| 815-814- | Wireless | Woodstock | T-mobile Usa |
| 815-336- | Landline | Milledgeville | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-420- | Landline | Malta | Essex Telcom |
| 815-548- | Landline | Sterling | Ameritech Illinois |
| 815-231- | Landline | Rockford | Ameritech Illinois |
| 815-216- | Wireless | Kankakee | Cellco Partnership DBA Verizon Wireless |
| 815-254- | Landline | Plainfield | Ameritech Illinois |
| 815-747- | Landline | East Dubuque | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-776- | Landline | Galena | Ameritech Illinois |
| 815-629- | Landline | Durand | Frontier North |
| 815-513- | Landline | Morris | Level 3 Communications |
| 815-808- | Landline | Winslow | Aero North Communications |
| 815-272- | Landline | Joliet | Mci Worldcom Communications |
| 815-472- | Landline | Momence | Ameritech Illinois |
| 815-901- | Landline | Dekalb | Comcast Phone Of Illinois DBA Comco |
| 815-923- | Landline | Union | Ameritech Illinois |
| 815-523- | Landline | Kankakee | Teleport Communications America |
| 815-528- | Landline | Mchenry | Teleport Communications America |
| 815-461- | Landline | Lockport | Broadwing Communications |
| 815-854- | Landline | Long Point | Frontier North |
| 815-766- | Wireless | Dekalb | United States Cellular Corp. - Illinois |
| 815-361- | Landline | Manhattan | Broadwing Communications |
| 815-335- | Landline | Winnebago | Frontier North |
| 815-842- | Landline | Pontiac | Frontier North |
| 815-900- | Landline | Amboy | Cricket Communications |
| 815-282- | Landline | Loves Park | Ameritech Illinois |
| 815-773- | Landline | Joliet | Ameritech Illinois |
| 815-518- | Landline | Coal City | First Communications LLC |
| 815-909- | Landline | Dekalb | T-mobile Usa |
| 815-722- | Landline | Joliet | Ameritech Illinois |
| 815-590- | Wireless | Sterling | Sprint Spectrum L.p. |
| 815-641- | Wireless | Rockford | Cellco Partnership DBA Verizon Wireless |
| 815-787- | Landline | Dekalb | Frontier North |
| 815-649- | Landline | Gardner | Rcn Telecom Services Of Illinois |
| 815-839- | Landline | Kankakee | Xo Illinois |
| 815-240- | Landline | Rockford | Charter Fiberlink - Illinois |
| 815-840- | Landline | Stockton | Aero North Communications |
| 815-284- | Landline | Dixon | Gallatin River Communications DBA Centurylink |
| 815-620- | Landline | Prophetstown | Essex Telcom |
| 815-520- | Wireless | Rockford | Cellco Partnership DBA Verizon Wireless |
| 815-990- | Wireless | Freeport | Cellco Partnership DBA Verizon Wireless |
| 815-445- | Landline | Sheffield | Frontier North |
| 815-993- | Wireless | Oglesby | New Cingular Wireless PCS |
| 815-876- | Landline | Princeton | Frontier North |
| 815-535- | Landline | Sterling | Ameritech Illinois |
| 815-292- | Landline | South Beloit | Bergen Telephone Co. - Illinois |
| 815-222- | Wireless | Rockford | Cellco Partnership DBA Verizon Wireless |
| 815-578- | Landline | Mchenry | Ameritech Illinois |
| 815-781- | Landline | Chebanse | Rcn Telecom Services Of Illinois |
| 815-358- | Landline | Cornell | C-r Telephone Co. |
| 815-502- | Landline | Woodstock | First Communications LLC |
| 815-244- | Landline | Mt Carroll | Gallatin River Communications DBA Centurylink |
| 815-346- | Landline | Gardner | Broadwing Communications |
| 815-945- | Landline | Chenoa | Frontier North |
| 815-612- | Landline | Graymont | Bitwise Communications |
| 815-448- | Landline | Mazon | Ameritech Illinois |
| 815-423- | Landline | Elwood | Ameritech Illinois |
| 815-258- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-740- | Landline | Joliet | Ameritech Illinois |
| 815-643- | Landline | Malden | Frontier North |
| 815-339- | Landline | Granville | Frontier North |
| 815-969- | Landline | Rockford | Ameritech Illinois |
| 815-818- | Landline | Warren | Aero North Communications |
| 815-623- | Landline | Roscoe | Frontier North |
| 815-940- | Landline | Gardner | Level 3 Communications |
| 815-263- | Wireless | Kankakee | Cellco Partnership DBA Verizon Wireless |
| 815-362- | Landline | German Valley | Frontier North |
| 815-883- | Landline | Oglesby | Ameritech Illinois |
| 815-310- | Landline | Utica | Broadwing Communications |
| 815-978- | Wireless | Rockford | Cellco Partnership DBA Verizon Wireless |
| 815-563- | Landline | Dakota | Frontier North |
| 815-796- | Landline | Flanagan | Frontier Communications Of Prairie |
| 815-743- | Landline | Graymont | Frontier Communications Of Prairie |
| 815-861- | Wireless | Woodstock | New Cingular Wireless PCS |
| 815-539- | Landline | Mendota | Frontier North |
| 815-635- | Landline | Chatsworth | Frontier North |
| 815-374- | Landline | Dwight | Us Xchange Of Illinois LLC DBA Choice One Comm Il |
| 815-301- | Landline | Crystal Lake | Broadwing Communications |
| 815-754- | Landline | Dekalb | Frontier North |
| 815-662- | Landline | Momence | Level 3 Communications |
| 815-567- | Landline | Emington | Frontier North |
| 815-928- | Landline | Kankakee | Ameritech Illinois |
| 815-434- | Landline | Ottawa | Ameritech Illinois |
| 815-955- | Wireless | Joliet | Sprint Spectrum L.p. |
| 815-899- | Landline | Sycamore | Frontier North |
| 815-492- | Landline | Apple River | Frontier North |
| 815-799- | Landline | Sterling | Level 3 Communications |
| 815-999- | Landline | Joliet | Sprint Spectrum L.p. |
| 815-764- | Wireless | Dekalb | United States Cellular Corp. - Illinois |
| 815-651- | Landline | Joliet | Rcn Telecom Services Of Illinois |
| 815-683- | Landline | Crescent City | Ameritech Illinois |
| 815-930- | Landline | Elizabeth | Mediacom Telephony Of Illinois |
| 815-556- | Landline | Plainfield | Broadwing Communications |
| 815-729- | Landline | Joliet | Ameritech Illinois |
| 815-591- | Landline | Hanover | Frontier North |
| 815-838- | Landline | Lockport | Ameritech Illinois |
| 815-831- | Landline | Davis | Aero North Communications |
| 815-933- | Landline | Kankakee | Ameritech Illinois |
| 815-269- | Landline | Danforth | Frontier Communications Of The Carolinas, Inc |
| 815-632- | Landline | Sterling | Ameritech Illinois |
| 815-499- | Wireless | Sterling | United States Cellular Corp. - Illinois |
| 815-830- | Wireless | Oglesby | New Cingular Wireless PCS |
| 815-256- | Landline | Stelle | Stelle Telephone Co. |
| 815-755- | Wireless | Dekalb | American Messaging (am) |
| 815-771- | Landline | Ashkum | Rcn Telecom Services Of Illinois |
| 815-932- | Landline | Kankakee | Ameritech Illinois |
| 815-252- | Wireless | Oglesby | New Cingular Wireless PCS |
| 815-735- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-902- | Landline | Lyndon | Mediacom Telephony Of Illinois |
| 815-922- | Wireless | Kankakee | Cellco Partnership DBA Verizon Wireless |
| 815-977- | Landline | Rockford | Mci Worldcom Communications |
| 815-476- | Landline | Wilmington | Ameritech Illinois |
| 815-946- | Landline | Polo | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-951- | Landline | Amboy | Essex Telcom |
| 815-543- | Wireless | Rockford | United States Cellular Corp. - Illinois |
| 815-974- | Landline | Tampico | Essex Telcom |
| 815-237- | Landline | Gardner | Ameritech Illinois |
| 815-279- | Wireless | Kankakee | American Messaging (am) |
| 815-554- | Landline | East Dubuque | Mediacom Telephony Of Illinois |
| 815-979- | Wireless | Rockford | Cellco Partnership DBA Verizon Wireless |
| 815-300- | Landline | Chicago | Ameritech Illinois |
| 815-664- | Landline | Spring Valley | Frontier North |
| 815-405- | Wireless | Joliet | Sprint Spectrum L.p. |
| 815-758- | Landline | Dekalb | Frontier North |
| 815-302- | Wireless | Joliet | Sprint Spectrum L.p. |
| 815-236- | Wireless | Woodstock | New Cingular Wireless PCS |
| 815-435- | Landline | Beaverville | Frontier North |
| 815-385- | Landline | Mchenry | Ameritech Illinois |
| 815-349- | Landline | Mchenry | Xo Illinois |
| 815-835- | Landline | Dixon | Essex Telcom |
| 815-753- | Landline | Dekalb | Frontier North |
| 815-873- | Landline | New Milford | Frontier North |
| 815-213- | Wireless | Sterling | United States Cellular Corp. - Illinois |
| 815-459- | Landline | Crystal Lake | Ameritech Illinois |
| 815-530- | Landline | Joliet | Sprint Spectrum L.p. |
| 815-850- | Landline | Pecatonica | Aero North Communications |
| 815-600- | Landline | Joliet | New Cingular Wireless PCS |
| 815-348- | Landline | Kankakee | Us Xchange Of Illinois LLC DBA Choice One Comm Il |
| 815-658- | Landline | Lanark | Essex Telcom |
| 815-574- | Landline | Harmon | Essex Telcom |
| 815-545- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-671- | Landline | Joliet | Level 3 Communications |
| 815-471- | Wireless | Watseka | Illinois Valley Cellular Rsa 2-i Partnership |
| 815-894- | Landline | Ladd | Frontier North |
| 815-625- | Landline | Sterling | Ameritech Illinois |
| 815-393- | Landline | Monroe Center | Frontier North |
| 815-438- | Landline | Tampico | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-217- | Landline | Dekalb | Digital Network Access Communications |
| 815-734- | Landline | Mt Morris | Frontier North |
| 815-414- | Wireless | Earlville | New Cingular Wireless PCS |
| 815-343- | Wireless | Oglesby | New Cingular Wireless PCS |
| 815-452- | Landline | Toluca | Frontier North |
| 815-746- | Landline | Marseilles | Marseilles Telephone Co. Of Marseilles |
| 815-406- | Landline | Byron | Frontier North |
| 815-736- | Landline | Lisbon | Ameritech Illinois |
| 815-895- | Landline | Sycamore | Frontier North |
| 815-428- | Landline | Martinton | Frontier North |
| 815-531- | Landline | Joliet | Teleport Communications America |
| 815-829- | Landline | Chadwick | Essex Telcom |
| 815-786- | Landline | Sandwich | Frontier North |
| 815-415- | Landline | Seneca | Ameritech Illinois |
| 815-626- | Landline | Sterling | Ameritech Illinois |
| 815-604- | Landline | Dixon | Essex Telcom |
| 815-356- | Landline | Crystal Lake | Ameritech Illinois |
| 815-749- | Wireless | Rockford | Answer America DBA Answer Usa |
| 815-707- | Landline | Gilman | Level 3 Communications |
| 815-897- | Landline | Lyndon | Mediacom Telephony Of Illinois |
| 815-450- | Wireless | Momence | New Cingular Wireless PCS |
| 815-444- | Landline | Crystal Lake | Ameritech Illinois |
| 815-859- | Landline | Rock Falls | Essex Telcom |
| 815-288- | Landline | Dixon | Gallatin River Communications DBA Centurylink |
| 815-741- | Landline | Joliet | Ameritech Illinois |
| 815-694- | Landline | Clifton | Frontier North |
| 815-601- | Landline | Rockford | Bitwise Communications |
| 815-877- | Landline | Loves Park | Ameritech Illinois |
| 815-241- | Wireless | Northbrook | American Messaging (am) |
| 815-762- | Wireless | Dekalb | Cellco Partnership DBA Verizon Wireless |
| 815-233- | Landline | Freeport | Frontier North |
| 815-803- | Landline | Byron | Aero North Communications |
| 815-387- | Landline | Rockford | Ameritech Illinois |
| 815-718- | Wireless | Sterling | United States Cellular Corp. - Illinois |
| 815-637- | Landline | Loves Park | Ameritech Illinois |
| 815-790- | Wireless | Woodstock | Sprint Spectrum L.p. |
| 815-665- | Landline | Ottawa | Rcn Telecom Services Of Illinois |
| 815-519- | Wireless | Rockford | Sprint Spectrum L.p. |
| 815-841- | Landline | Mt Morris | Essex Telcom |
| 815-232- | Landline | Freeport | Frontier North |
| 815-750- | Landline | Marseilles | Mtco Communications |
| 815-865- | Landline | Davis | Frontier North |
| 815-807- | Landline | German Valley | Aero North Communications |
| 815-529- | Wireless | Woodstock | Cellco Partnership DBA Verizon Wireless |
| 815-344- | Landline | Mchenry | Ameritech Illinois |
| 815-224- | Landline | La Salle | Ameritech Illinois |
| 815-661- | Landline | Morris | Rcn Telecom Services Of Illinois |
| 815-759- | Landline | Mchenry | Ameritech Illinois |
| 815-557- | Wireless | Joliet | Sprint Spectrum L.p. |
| 815-417- | Landline | Braidwood | Ameritech Illinois |
| 815-209- | Landline | Rockford | Level 3 Communications |
| 815-426- | Landline | Herscher | Ameritech Illinois |
| 815-462- | Landline | New Lenox | Ameritech Illinois |
| 815-227- | Landline | Rockford | Ameritech Illinois |
| 815-935- | Landline | Kankakee | Ameritech Illinois |
| 815-388- | Landline | Mchenry | Sprint Spectrum L.p. |
| 815-463- | Landline | New Lenox | Ameritech Illinois |
| 815-347- | Wireless | Woodstock | Cellco Partnership DBA Verizon Wireless |
| 815-678- | Landline | Richmond | Frontier North |
| 815-893- | Landline | Crystal Lake | Comcast Phone Of Illinois DBA Comco |
| 815-929- | Landline | Kankakee | Ameritech Illinois |
| 815-593- | Landline | Dekalb | AT&T Local |
| 815-624- | Landline | Rockton | Frontier North |
| 815-260- | Wireless | Joliet | Sprint Spectrum L.p. |
| 815-508- | Wireless | Dekalb | New Cingular Wireless PCS |
| 815-987- | Landline | Rockford | Ameritech Illinois |
| 815-989- | Landline | Prophetstown | Mediacom Telephony Of Illinois |
| 815-630- | Wireless | Joliet | T-mobile Usa |
| 815-546- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-920- | Landline | Cornell | Mediacom Telephony Of Illinois |
| 815-868- | Landline | Mc Connell | Frontier North |
| 815-844- | Landline | Pontiac | Frontier North |
| 815-262- | Wireless | Rockford | Cellco Partnership DBA Verizon Wireless |
| 815-413- | Landline | Morris | First Communications LLC |
| 815-278- | Wireless | Kankakee | Cellco Partnership DBA Verizon Wireless |
| 815-538- | Landline | Mendota | Frontier North |
| 815-298- | Wireless | Rockford | Cellco Partnership DBA Verizon Wireless |
| 815-673- | Landline | Streator | Frontier North |
| 815-636- | Landline | Loves Park | Ameritech Illinois |
| 815-870- | Wireless | Rockford | Usa Mobility Wireless |
| 815-676- | Landline | Plainfield | Level 3 Communications |
| 815-692- | Landline | Fairbury | Frontier North |
| 815-908- | Wireless | Freeport | Sprint Communications Company, L.p. |
| 815-271- | Landline | Mchenry | Mci Worldcom Communications |
| 815-481- | Wireless | La Grange Park | Illinois Valley Cellular Rsa 2-i Partnership |
| 815-251- | Landline | Rock Falls | Gallatin River Communications DBA Centurylink |
| 815-542- | Landline | Tampico | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-733- | Landline | Plainfield | Rcn Telecom Services Of Illinois |
| 815-294- | Wireless | La Grange Park | Usa Mobility Wireless |
| 815-816- | Landline | Dakota | Aero North Communications |
| 815-576- | Landline | Polo | Essex Telcom |
| 815-934- | Landline | Emington | Frontier North |
| 815-891- | Landline | Winnebago | Aero North Communications |
| 815-328- | Landline | Lockport | Broadwing Communications |
| 815-501- | Wireless | Dekalb | Sprint Spectrum L.p. |
| 815-879- | Landline | Princeton | Frontier North |
| 815-247- | Landline | Pecatonica | Frontier North |
| 815-245- | Wireless | Woodstock | New Cingular Wireless PCS |
| 815-401- | Landline | Kankakee | Level 3 Communications |
| 815-230- | Landline | Plainfield | Broadwing Communications |
| 815-308- | Landline | Woodstock | Broadwing Communications |
| 815-396- | Landline | Steward | Frontier North |
| 815-832- | Landline | Saunemin | Frontier Communications Of Illinois |
| 815-470- | Landline | Rockford | Ameritech Illinois |
| 815-386- | Wireless | Kankakee | Cellco Partnership DBA Verizon Wireless |
| 815-579- | Wireless | La Salle | Sprint Spectrum L.p. |
| 815-686- | Landline | Piper City | Frontier North |
| 815-373- | Landline | Elwood | Us Xchange Of Illinois LLC DBA Choice One Comm Il |
| 815-970- | Wireless | Sycamore | Sprint Spectrum L.p. |
| 815-559- | Landline | Fulton | Essex Telcom |
| 815-648- | Landline | Hebron | Frontier North |
| 815-290- | Landline | Minooka | Sbc Internet Services |
| 815-549- | Wireless | Kankakee | Sprint Spectrum L.p. |
| 815-410- | Landline | La Salle | Level 3 Communications |
| 815-370- | Wireless | Kankakee | Cellco Partnership DBA Verizon Wireless |
| 815-639- | Landline | Loves Park | Ameritech Illinois |
| 815-628- | Landline | West Brooklyn | Frontier North |
| 815-918- | Landline | Clifton | Level 3 Communications |
| 815-680- | Landline | Manhattan | Rcn Telecom Services Of Illinois |
| 815-219- | Wireless | Crystal Lake | Sprint Spectrum L.p. |
| 815-833- | Landline | Mc Connell | Aero North Communications |
| 815-466- | Landline | Grant Park | Ameritech Illinois |
| 815-430- | Landline | Mchenry | First Communications LLC |
| 815-856- | Landline | Tonica | Leonore Mutual Telephone Co. |
| 815-265- | Landline | Gilman | Ameritech Illinois |
| 815-437- | Landline | Putnam | Frontier North |
| 815-652- | Landline | Dixon | Gallatin River Communications DBA Centurylink |
| 815-696- | Landline | Roscoe | Aero North Communications |
| 815-238- | Wireless | Freeport | Cellco Partnership DBA Verizon Wireless |
| 815-800- | Landline | Poplar Grove | Mediacom Telephony Of Illinois |
| 815-938- | Landline | Forreston | Frontier North |
| 815-998- | Landline | Odell | Frontier North |
| 815-670- | Wireless | Rockford | Sprint Spectrum L.p. |
| 815-402- | Landline | Galena | Level 3 Communications |
| 815-201- | Wireless | Rockford | Bandwidth.com Clec |
| 815-322- | Landline | Mchenry | Level 3 Communications |
| 815-954- | Wireless | Kankakee | Cellco Partnership DBA Verizon Wireless |
| 815-667- | Landline | Utica | Ameritech Illinois |
| 815-398- | Landline | Rockford | Ameritech Illinois |
| 815-874- | Landline | New Milford | Frontier North |
| 815-248- | Landline | Durand | Frontier North |
| 815-527- | Landline | Woodstock | Teleport Communications America |
| 815-325- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-429- | Landline | Sheldon | Frontier North |
| 815-631- | Landline | Sterling | Ameritech Illinois |
| 815-917- | Landline | Rochelle | Essex Telcom |
| 815-324- | Landline | Ottawa | Mediacom Telephony Of Illinois |
| 815-289- | Wireless | Rockford | United States Cellular Corp. - Illinois |
| 815-577- | Landline | Plainfield | Ameritech Illinois |
| 815-972- | Landline | Rockford | Ameritech Illinois |
| 815-812- | Landline | Dakota | Aero North Communications |
| 815-727- | Landline | Joliet | Ameritech Illinois |
| 815-720- | Landline | Rockford | Ameritech Illinois |
| 815-638- | Landline | La Moille | Frontier North |
| 815-350- | Landline | Franklin Grove | Essex Telcom |
| 815-684- | Landline | Chadwick | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-964- | Landline | Rockford | Ameritech Illinois |
| 815-243- | Wireless | Rockford | United States Cellular Corp. - Illinois |
| 815-392- | Landline | Kinsman | Kinsman Mutual Telephone Company |
| 815-730- | Landline | Joliet | Ameritech Illinois |
| 815-273- | Landline | Savanna | Gallatin River Communications DBA Centurylink |
| 815-948- | Landline | Prophetstown | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-524- | Landline | Lockport | Teleport Communications America |
| 815-363- | Landline | Mchenry | Ameritech Illinois |
| 815-962- | Landline | Rockford | Ameritech Illinois |
| 815-693- | Wireless | Joliet | Sprint Spectrum L.p. |
| 815-984- | Landline | Wellington | Frontier Communications Of The Carolinas, Inc |
| 815-568- | Landline | Marengo | Ameritech Illinois |
| 815-968- | Landline | Rockford | Ameritech Illinois |
| 815-239- | Landline | Pecatonica | Frontier North |
| 815-890- | Landline | New Milford | Aero North Communications |
| 815-942- | Landline | Morris | Ameritech Illinois |
| 815-573- | Landline | Kankakee | Level 3 Communications |
| 815-660- | Landline | Lockport | Rcn Telecom Services Of Illinois |
| 815-875- | Landline | Princeton | Frontier North |
| 815-654- | Landline | Loves Park | Ameritech Illinois |
| 815-584- | Landline | Dwight | Ameritech Illinois |
| 815-360- | Landline | Sublette | Essex Telcom |
| 815-369- | Landline | Lena | Frontier North |
| 815-892- | Landline | Shannon | Essex Telcom |
| 815-716- | Wireless | Sterling | Sprint Spectrum L.p. |
| 815-806- | Landline | Frankfort | Ameritech Illinois |
| 815-453- | Landline | Ashton | Frontier North |
| 815-465- | Landline | Grant Park | Ameritech Illinois |
| 815-622- | Landline | Sterling | Ameritech Illinois |
| 815-333- | Landline | Woodstock | Broadwing Communications |
| 815-246- | Landline | Earlville | Frontier North |
| 815-728- | Landline | Wonder Lake | Frontier North |
| 815-756- | Landline | Dekalb | Frontier North |
| 815-412- | Landline | Frankfort | Broadwing Communications |
| 815-409- | Wireless | Joliet | Cellco Partnership DBA Verizon Wireless |
| 815-912- | Landline | Belvidere | Aero North Communications |
| 815-798- | Landline | Milledgeville | Essex Telcom |
| 815-475- | Landline | Yorkville | Ameritech Illinois |
| 815-784- | Landline | Genoa | Frontier North |
| 815-725- | Landline | Joliet | Ameritech Illinois |
| 815-906- | Landline | Mt Carroll | Mediacom Telephony Of Illinois |
| 815-304- | Landline | Kankakee | Broadwing Communications |
| 815-650- | Landline | Freeport | AT&T Local |
| 815-397- | Landline | Rockford | Ameritech Illinois |
| 815-949- | Landline | Cabery | Frontier North |
| 815-851- | Wireless | Kankakee | Usa Mobility Wireless |
| 815-952- | Landline | Lanark | Aero North Communications |
| 815-277- | Landline | Frankfort | Teleport Communications America |
| 815-334- | Landline | Woodstock | Ameritech Illinois |
| 815-971- | Landline | Rockford | Ameritech Illinois |
| 815-836- | Landline | Lockport | Ameritech Illinois |
| 815-617- | Landline | Ottawa | AT&T Local |
| 815-477- | Landline | Crystal Lake | Ameritech Illinois |
| 815-927- | Landline | Joliet | Broadwing Communications |
| 815-888- | Landline | Rochelle | Level 3 Communications |
| 815-442- | Landline | Tonica | Tonica Telephone Co. |
| 815-961- | Landline | Rockford | Ameritech Illinois |
| 815-616- | Wireless | Freeport | T-mobile Usa |
| 815-732- | Landline | Oregon | Frontier North |
| 815-537- | Landline | Prophetstown | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-772- | Landline | Morrison | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-653- | Landline | Wonder Lake | Frontier North |
| 815-690- | Wireless | Joliet | Sprint Spectrum L.p. |
| 815-582- | Wireless | Joliet | T-mobile Usa |
| 815-925- | Landline | Hennepin | Frontier North |
| 815-210- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-981- | Landline | Ottawa | Level 3 Communications |
| 815-366- | Landline | Ottawa | Broadwing Communications |
| 815-845- | Landline | Scales Mound | Frontier North |
| 815-717- | Landline | New Lenox | Broadwing Communications |
| 815-704- | Landline | Beloit | Mcleodusa Telecommunications Services- Il |
| 815-541- | Wireless | Freeport | United States Cellular Corp. - Illinois |
| 815-706- | Landline | Lyndon | Essex Telcom |
| 815-371- | Landline | Utica | Broadwing Communications |
| 815-936- | Landline | Kankakee | Ameritech Illinois |
| 815-580- | Landline | Rockford | AT&T Local |
| 815-440- | Wireless | Dixon | Cellco Partnership DBA Verizon Wireless |
| 815-698- | Landline | Ashkum | Frontier North |
| 815-432- | Landline | Watseka | Ameritech Illinois |
| 815-801- | Landline | Freeport | Aero North Communications |
| 815-234- | Landline | Byron | Frontier North |
| 815-433- | Landline | Ottawa | Ameritech Illinois |
| 815-586- | Landline | Ransom | C-r Telephone Co. |
| 815-702- | Landline | Saunemin | Sprint Communications Company, L.p. |
| 815-688- | Landline | Strawn | Frontier North |
| 815-910- | Wireless | Mendota | Illinois Valley Cellular Rsa 2-i Partnership |
| 815-907- | Landline | Manteno | Broadwing Communications |
| 815-668- | Landline | Rockford | Neutral Tandem-illinois |
| 815-592- | Wireless | Kankakee | Cellco Partnership DBA Verizon Wireless |
| 815-551- | Landline | Savanna | Essex Telcom |
| 815-483- | Wireless | Joliet | Sprint Spectrum L.p. |
| 815-270- | Landline | Lanark | Charter Fiberlink - Illinois |
| 815-467- | Landline | Minooka | Ameritech Illinois |
| 815-204- | Wireless | Crystal Lake | Usa Mobility Wireless |
| 815-500- | Landline | Marseilles | Sprint Communications Company, L.p. |
| 815-791- | Wireless | Joliet | Sprint Spectrum L.p. |
| 815-726- | Landline | Joliet | Ameritech Illinois |
| 815-802- | Landline | Kankakee | Ameritech Illinois |
| 815-983- | Wireless | Rockford | American Messaging (am) |
| 815-384- | Landline | Malta | Frontier North |
| 815-221- | Landline | Lockport | Teleport Communications America |
| 815-533- | Wireless | La Grange Park | Indiana Paging Ntwk |
| 815-860- | Landline | Elwood | Teleport Communications America |
| 815-898- | Landline | Elizabeth | Aero North Communications |
| 815-354- | Wireless | Woodstock | Cellco Partnership DBA Verizon Wireless |
| 815-608- | Wireless | Rockford | T-mobile Usa |
| 815-985- | Wireless | Rockford | Cellco Partnership DBA Verizon Wireless |
| 815-723- | Landline | Joliet | Ameritech Illinois |
| 815-372- | Landline | Romeoville | Ameritech Illinois |
| 815-351- | Wireless | Kankakee | Cellco Partnership DBA Verizon Wireless |
| 815-295- | Landline | Kankakee | T-mobile Usa |
| 815-896- | Landline | Durand | Aero North Communications |
| 815-947- | Landline | Stockton | Frontier North |
| 815-436- | Landline | Plainfield | Ameritech Illinois |
| 815-267- | Landline | Plainfield | Mci Worldcom Communications |
| 815-285- | Landline | Dixon | Gallatin River Communications DBA Centurylink |
| 815-451- | Wireless | Woodstock | New Cingular Wireless PCS |
| 815-399- | Landline | Rockford | Ameritech Illinois |
| 815-647- | Landline | Cullom | Mediacom Telephony Of Illinois |
| 815-404- | Wireless | Crystal Lake | Sprint Spectrum L.p. |
| 815-229- | Landline | Rockford | Ameritech Illinois |
| 815-669- | Landline | Mchenry | Level 3 Communications |
| 815-479- | Landline | Crystal Lake | Ameritech Illinois |
| 815-416- | Landline | Morris | Ameritech Illinois |
| 815-986- | Wireless | Rockford | Us Xchange Of Illinois LLC DBA Choice One Comm Il |
| 815-994- | Wireless | Dixon | Sprint Spectrum L.p. |
| 815-340- | Landline | La Moille | Comcast Phone Of Illinois DBA Comco |
| 815-503- | Wireless | Mendota | Sprint Spectrum L.p. |
| 815-303- | Wireless | Princeton | Illinois Valley Cellular Rsa 2-i Partnership |
| 815-809- | Landline | Lena | Aero North Communications |
| 815-307- | Landline | Mchenry | Broadwing Communications |
| 815-980- | Wireless | Rockford | Cellco Partnership DBA Verizon Wireless |
| 815-610- | Landline | Cornell | Bitwise Communications |
| 815-441- | Wireless | Sterling | Cellco Partnership DBA Verizon Wireless |
| 815-793- | Wireless | Dekalb | T-mobile Usa |
| 815-581- | Landline | Spring Grove | Comcast Phone Of Illinois DBA Comco |
| 815-553- | Landline | Joliet | Ovation Communications Of Illinois |
| 815-627- | Landline | Paw Paw | Frontier North |
| 815-715- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-921- | Landline | Rockford | Ameritech Illinois |
| 815-599- | Landline | Freeport | Frontier North |
| 815-914- | Wireless | Rockford | Sprint Spectrum L.p. |
| 815-619- | Landline | Rockton | Aero North Communications |
| 815-689- | Landline | Cullom | Frontier Communications Of Illinois |
| 815-427- | Landline | St Anne | Ameritech Illinois |
| 815-703- | Wireless | Rockford | Sprint Spectrum L.p. |
| 815-817- | Landline | Hanover | Aero North Communications |
| 815-956- | Landline | Morrison | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-320- | Wireless | Kankakee | Peerless Network Of Illinois |
| 815-312- | Landline | Rockford | Ymax Communications Corp. |
| 815-299- | Wireless | Rockford | United States Cellular Corp. - Illinois |
| 815-281- | Wireless | Galena | United States Cellular Corp. - Illinois |
| 815-769- | Landline | Seneca | Broadwing Communications |
| 815-515- | Landline | Watseka | Level 3 Communications |
| 815-724- | Landline | Joliet | Ameritech Illinois |
| 815-291- | Wireless | Freeport | United States Cellular Corp. - Illinois |
| 815-367- | Landline | Winslow | Frontier North |
| 815-640- | Landline | Ottawa | Teleport Communications America |
| 815-490- | Landline | Rockford | Ameritech Illinois |
| 815-752- | Landline | Dekalb | Frontier North |
| 815-905- | Landline | Lockport | Level 3 Communications |
| 815-552- | Landline | Lockport | Ameritech Illinois |
| 815-598- | Landline | Elizabeth | Frontier North |
| 815-206- | Landline | Woodstock | Ameritech Illinois |
| 815-342- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-287- | Landline | Verona | Ameritech Illinois |
| 815-425- | Landline | Crystal Lake | Broadwing Communications |
| 815-869- | Landline | Magnolia | Frontier North |
| 815-939- | Landline | Kankakee | Ameritech Illinois |
| 815-532- | Wireless | Morris | Usa Mobility Wireless |
| 815-679- | Landline | Mchenry | Rcn Telecom Services Of Illinois |
| 815-382- | Wireless | Woodstock | New Cingular Wireless PCS |
| 815-677- | Landline | Elizabeth | Cellco Partnership DBA Verizon Wireless |
| 815-633- | Landline | Loves Park | Ameritech Illinois |
| 815-813- | Landline | Apple River | Aero North Communications |
| 815-609- | Landline | Plainfield | Ameritech Illinois |
| 815-991- | Landline | Sycamore | Essex Telcom |
| 815-564- | Landline | Sterling | Ameritech Illinois |
| 815-588- | Landline | Lockport | Ameritech Illinois |
| 815-644- | Landline | Crescent City | Rcn Telecom Services Of Illinois |
| 815-526- | Landline | Crystal Lake | Teleport Communications America |
| 815-305- | Landline | Gardner | Broadwing Communications |
| 815-368- | Landline | Lostant | Frontier North |
| 815-255- | Landline | Minooka | Us Xchange Of Illinois LLC DBA Choice One Comm Il |
| 815-454- | Landline | Sheffield | Frontier North |
| 815-721- | Landline | Rockford | AT&T Local |
| 815-884- | Landline | Harvard | Mediacom Telephony Of Illinois |
| 815-464- | Landline | Frankfort | Ameritech Illinois |
| 815-391- | Landline | Rockford | Ameritech Illinois |
| 815-867- | Wireless | Pontiac | Sprint Spectrum L.p. |
| 815-375- | Wireless | Dekalb | United States Cellular Corp. - Illinois |
| 815-283- | Landline | Dekalb | Mediacom Telephony Of Illinois |
| 815-407- | Landline | Romeoville | Ameritech Illinois |
| 815-286- | Landline | Hinckley | Frontier North |
| 815-208- | Landline | Fulton | Mediacom Telephony Of Illinois |
| 815-656- | Landline | Freeport | Level 3 Communications |
| 815-494- | Wireless | Rockford | United States Cellular Corp. - Illinois |
| 815-919- | Wireless | Joliet | T-mobile Usa |
| 815-642- | Landline | Minooka | Broadwing Communications |
| 815-973- | Wireless | Dixon | United States Cellular Corp. - Illinois |
| 815-341- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-903- | Wireless | Mchenry | American Messaging (am) |
| 815-352- | Landline | Kankakee | Broadwing Communications |
| 815-748- | Landline | Dekalb | Frontier North |
| 815-522- | Landline | Kirkland | Frontier North |
| 815-882- | Landline | Mc Nabb | Mcnabb Telephone Co. |
| 815-751- | Wireless | Dekalb | Cellco Partnership DBA Verizon Wireless |
| 815-822- | Wireless | Streator | New Cingular Wireless PCS |
| 815-408- | Landline | Utica | First Communications LLC |
| 815-804- | Landline | Pecatonica | Aero North Communications |
| 815-562- | Landline | Rochelle | Frontier North |
| 815-378- | Wireless | Rockford | Sprint Spectrum L.p. |
| 815-675- | Landline | Spring Grove | Frontier North |
| 815-605- | Landline | Grant Park | Level 3 Communications |
| 815-866- | Wireless | Princeton | Illinois Valley Cellular Rsa 2-i Partnership |
| 815-846- | Landline | Joliet | Broadwing Communications |
| 815-805- | Landline | Durand | Aero North Communications |
| 815-468- | Landline | Manteno | Ameritech Illinois |
| 815-828- | Landline | Minooka | Xo Illinois |
| 815-482- | Wireless | Woodstock | Sprint Spectrum L.p. |
| 815-957- | Landline | Rockton | Level 3 Communications |
| 815-504- | Landline | Gardner | First Communications LLC |
| 815-995- | Landline | Dekalb | Teleport Communications America |
| 815-207- | Landline | Joliet | AT&T Local |
| 815-843- | Landline | Ashton | Essex Telcom |
| 815-353- | Wireless | Woodstock | Cellco Partnership DBA Verizon Wireless |
| 815-960- | Landline | Leaf River | North County Communications Corp. - CA |
| 815-215- | Landline | New Lenox | First Communications LLC |
| 815-484- | Landline | Rockford | Ameritech Illinois |
| 815-967- | Landline | Rockford | Ameritech Illinois |
| 815-687- | Landline | Woodstock | Rcn Telecom Services Of Illinois |
| 815-330- | Landline | Crescent City | First Communications LLC |
| 815-685- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-602- | Landline | Kankakee | First Communications LLC |
| 815-855- | Landline | Milledgeville | Mediacom Telephony Of Illinois |
| 815-550- | Landline | Grant Park | Broadwing Communications |
| 815-674- | Wireless | Streator | New Cingular Wireless PCS |
| 815-431- | Landline | Ottawa | Ameritech Illinois |
| 815-293- | Landline | Romeoville | Ameritech Illinois |
| 815-316- | Landline | Rockford | Tds Metrocom Inc.-il |
| 815-745- | Landline | Warren | Frontier North |
| 815-785- | Landline | Watseka | Rcn Telecom Services Of Illinois |
| 815-276- | Landline | Crystal Lake | Teleport Communications America |
| 815-966- | Landline | Rockford | Ameritech Illinois |
| 815-460- | Landline | Joliet | First Communications LLC |
| 815-737- | Landline | Capron | Sharon Telephone Co. - Illinois |
| 815-200- | Landline | La Salle | Paetec Communications |
| 815-418- | Landline | Manhattan | First Communications LLC |
| 815-275- | Wireless | Freeport | Cellco Partnership DBA Verizon Wireless |
| 815-848- | Wireless | Pontiac | Illinois Valley Cellular Rsa 2-i Partnership |
| 815-266- | Landline | Freeport | Frontier North |
| 815-486- | Landline | Donovan | Frontier North |
| 815-212- | Landline | Joliet | T-mobile Usa |
| 815-225- | Landline | Milledgeville | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-826- | Wireless | Somonauk | Cellco Partnership DBA Verizon Wireless |
| 815-963- | Landline | Rockford | Ameritech Illinois |
| 815-489- | Landline | Rockford | Ameritech Illinois |
| 815-509- | Wireless | Rockford | Sprint Spectrum L.p. |
| 815-443- | Landline | Pearl City | Frontier North |
| 815-915- | Landline | Coal City | Level 3 Communications |
| 815-264- | Landline | Waterman | Frontier North |
| 815-621- | Wireless | Rockford | Sprint Spectrum L.p. |
| 815-708- | Landline | Rockford | Comcast Phone Of Illinois DBA Comco |
| 815-778- | Landline | Lyndon | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-359- | Landline | Harmon | Gallatin River Communications DBA Centurylink |
| 815-731- | Landline | Plainfield | Ameritech Illinois |
| 815-880- | Landline | Woodstock | Xo Illinois |
| 815-606- | Landline | Ottawa | First Communications LLC |
| 815-941- | Landline | Morris | Ameritech Illinois |
| 815-607- | Landline | Flanagan | Bitwise Communications |
| 815-474- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-536- | Wireless | La Grange Park | Usa Mobility Wireless |
| 815-824- | Landline | Shabbona | Frontier North |
| 815-517- | Landline | Dekalb | Mci Worldcom Communications |
| 815-514- | Wireless | Joliet | Sprint Spectrum L.p. |
| 815-691- | Landline | Utica | Rcn Telecom Services Of Illinois |
| 815-379- | Landline | Walnut | Frontier North |
| 815-871- | Wireless | Rockford | United States Cellular Corp. - Illinois |
| 815-560- | Landline | Harvard | Sprint Spectrum L.p. |
| 815-797- | Landline | Somonauk | Level 3 Communications |
| 815-389- | Landline | Beloit | Ameritech Illinois |
| 815-313- | Landline | Ottawa | Broadwing Communications |
| 815-827- | Landline | Maple Park | Frontier North |
| 815-268- | Landline | Onarga | Ameritech Illinois |
| 815-540- | Wireless | Rockford | Sprint Spectrum L.p. |
| 815-498- | Landline | Somonauk | Frontier North |
| 815-881- | Landline | Oregon | Essex Telcom |
| 815-566- | Landline | Belvidere | Level 3 Communications |
| 815-355- | Wireless | Woodstock | Cellco Partnership DBA Verizon Wireless |
| 815-937- | Landline | Kankakee | Ameritech Illinois |
| 815-505- | Wireless | Rockford | T-mobile Usa |
| 815-458- | Landline | Braidwood | Ameritech Illinois |
| 815-345- | Landline | Woodstock | Level 3 Communications |
| 815-561- | Landline | Rochelle | Frontier North |
| 815-583- | Landline | Morrison | Essex Telcom |
| 815-575- | Wireless | Woodstock | New Cingular Wireless PCS |
| 815-473- | Landline | Watseka | Frontier Communications Of The Carolinas, Inc |
| 815-863- | Landline | Rutland | Frontier North |
| 815-395- | Landline | Rockford | Ameritech Illinois |
| 815-521- | Landline | Minooka | Ameritech Illinois |
| 815-761- | Wireless | Dekalb | Cellco Partnership DBA Verizon Wireless |
| 815-768- | Wireless | Joliet | Ameritech Illinois |
| 815-926- | Landline | Wilmington | Broadwing Communications |
| 815-655- | Landline | Milledgeville | Essex Telcom |
| 815-913- | Landline | Joliet | Sprint Communications Company, L.p. |
| 815-770- | Landline | Harvard | Charter Fiberlink - Illinois |
| 815-421- | Landline | Herscher | Ameritech Illinois |
| 815-317- | Landline | Crescent City | Broadwing Communications |
| 815-857- | Landline | Amboy | Frontier North |
| 815-767- | Wireless | La Grange Park | American Messaging (am) |
| 815-381- | Landline | Rockford | Ameritech Illinois |
| 815-589- | Landline | Fulton | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-996- | Wireless | Savanna | Sprint Spectrum L.p. |
| 815-682- | Landline | Milford | Frontier Communications Of The Carolinas, Inc |
| 815-705- | Landline | Morris | Teleport Communications America |
| 815-634- | Landline | Coal City | Ameritech Illinois |
| 815-739- | Wireless | Sycamore | Sprint Spectrum L.p. |
| 815-380- | Landline | Sterling | Essex Telcom |
| 815-775- | Wireless | Woodstock | Usa Mobility Wireless |
| 815-982- | Landline | Tampico | Essex Telcom |
| 815-510- | Landline | Streator | Mediacom Telephony Of Illinois |
| 815-331- | Landline | Mchenry | Broadwing Communications |
| 815-400- | Landline | Morrison | Mediacom Telephony Of Illinois |
| 815-744- | Landline | Joliet | Ameritech Illinois |
| 815-493- | Landline | Lanark | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-326- | Wireless | Oglesby | New Cingular Wireless PCS |
| 815-202- | Wireless | Oglesby | New Cingular Wireless PCS |
| 815-944- | Landline | Saint Anne | Ameritech Illinois |
| 815-569- | Landline | Capron | Frontier North |
| 815-666- | Wireless | Joliet | Cellco Partnership DBA Verizon Wireless |
| 815-719- | Wireless | Princeton | Sprint Spectrum L.p. |
| 815-810- | Landline | Pearl City | Aero North Communications |
| 815-487- | Landline | Plainfield | First Communications LLC |
| 815-819- | Landline | Orangeville | Aero North Communications |
| 815-446- | Landline | Oglesby | Frontier North |
| 815-419- | Landline | Pontiac | AT&T Local |
| 815-261- | Landline | Crystal Lake | Mci Worldcom Communications |
| 815-988- | Wireless | Rockford | United States Cellular Corp. - Illinois |
| 815-788- | Landline | Crystal Lake | Ameritech Illinois |
| 815-613- | Landline | Mt Carroll | Essex Telcom |
| 815-821- | Landline | Freeport | United States Cellular Corp. - Illinois |
| 815-587- | Landline | Ottawa | Level 3 Communications |
| 815-205- | Wireless | La Grange Park | Centurylink Communications LLC |
| 815-506- | Landline | Union | Level 3 Communications |
| 815-364- | Landline | Morris | Broadwing Communications |
| 815-214- | Landline | Kankakee | Rcn Telecom Services Of Illinois |
| 815-834- | Landline | Lockport | Ameritech Illinois |
| 815-887- | Landline | Harvard | Teleport Communications America |
| 815-250- | Landline | La Salle | Comcast Phone Of Illinois DBA Comco |
| 815-820- | Landline | Elizabeth | Aero North Communications |
| 815-780- | Landline | La Salle | Broadwing Communications |
| 815-852- | Landline | Scales Mound | Aero North Communications |
| 815-570- | Landline | Sandwich | Level 3 Communications |
| 815-603- | Wireless | Kankakee | T-mobile Usa |
| 815-849- | Landline | Sublette | Frontier North |
| 815-318- | Landline | Morris | Broadwing Communications |
| 815-469- | Landline | Frankfort | Ameritech Illinois |
| 815-597- | Landline | Garden Prairie | Frontier North |
| 815-394- | Landline | Rockford | Ameritech Illinois |
| 815-646- | Landline | Tiskilwa | Frontier North |
| 815-714- | Landline | Joliet | Sprint Communications Company, L.p. |
| 815-872- | Landline | Princeton | Frontier North |
| 815-228- | Wireless | Oglesby | New Cingular Wireless PCS |
| 815-512- | Landline | Lockport | First Communications LLC |
| 815-383- | Wireless | Crescent City | New Cingular Wireless PCS |
| 815-226- | Landline | Rockford | Ameritech Illinois |
| 815-422- | Landline | St Anne | Ameritech Illinois |
| 815-765- | Landline | Poplar Grove | Frontier North |
| 815-614- | Landline | Kankakee | Broadwing Communications |
| 815-306- | Landline | Lockport | Broadwing Communications |
| 815-253- | Landline | Kempton | Frontier Communications Of Illinois |
| 815-783- | Landline | Gilman | Rcn Telecom Services Of Illinois |
| 815-323- | Landline | Belvidere | Level 3 Communications |
| 815-377- | Landline | Crescent City | Broadwing Communications |
| 815-757- | Wireless | Dekalb | United States Cellular Corp. - Illinois |
| 815-449- | Landline | Dakota | Frontier North |
| 815-223- | Landline | La Salle | Ameritech Illinois |
| 815-663- | Landline | Spring Valley | Frontier North |
| 815-257- | Wireless | Streator | Illinois Valley Cellular Rsa 2-ii Partnership |
| 815-699- | Landline | Wyanet | Frontier North |
| 815-447- | Landline | Spring Valley | Frontier Communications Of Depue |
| 815-571- | Landline | Shannon | Mediacom Telephony Of Illinois |
| 815-916- | Wireless | Minooka | Broadvox-clec |
| 815-837- | Landline | Forreston | Aero North Communications |
| 815-516- | Landline | Rockford | Sprint Spectrum L.p. |
| 815-864- | Landline | Shannon | Citizens Telecom Co Illinois-frontier Citizens -il |
| 815-931- | Wireless | Joliet | New Cingular Wireless PCS |
| 815-858- | Landline | Elizabeth | Frontier North |
| 815-760- | Wireless | Hennepin | Cellco Partnership DBA Verizon Wireless |
| 815-457- | Landline | Cissna Park | Frontier Communications Of The Carolinas, Inc |
| 815-904- | Wireless | Rockford | New Cingular Wireless PCS |
| 815-497- | Landline | Compton | Frontier North |
| 815-259- | Landline | Thomson | Gallatin River Communications DBA Centurylink |
| 815-853- | Landline | Wenona | Frontier North |
| 815-697- | Landline | Chebanse | Frontier North |
| 815-220- | Landline | La Salle | Ameritech Illinois |
| 815-975- | Wireless | Belvidere | New Cingular Wireless PCS |
| 815-565- | Landline | Morrison | Mediacom Telephony Of Illinois |
| 815-596- | Landline | Marengo | Sbc Internet Services |
| 815-924- | Landline | Prophetstown | Essex Telcom |
| 815-544- | Landline | Belvidere | Frontier North |
| 815-329- | Landline | Rockford | Sbc Internet Services |
| 815-296- | Wireless | Rockford | Usa Mobility Wireless |
| 815-403- | Wireless | Mchenry | Sprint Spectrum L.p. |
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