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