ILLINOIS BELL TEL CO
257 prefixes in 773 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 773-202 | CHICGOZN03 | 9329 | — | Yes |
| 773-205 | CHICGOZN03 | 9329 | — | Yes |
| 773-210 | CHICGOZN01 | 9329 | — | — |
| 773-221 | CHICGOZN09 | 9329 | — | — |
| 773-224 | CHICGOZN07 | 9329 | — | — |
| 773-227 | CHICGOZN04 | 9329 | — | — |
| 773-229 | CHICGOZN08 | 9329 | — | — |
| 773-233 | CHICGOZN10 | 9329 | — | — |
| 773-235 | CHICGOZN04 | 9329 | — | — |
| 773-237 | CHICGOZN05 | 9329 | — | — |
| 773-238 | CHICGOZN10 | 9329 | — | — |
| 773-239 | CHICGOZN10 | 9329 | — | — |
| 773-241 | CHICGOZN07 | 9329 | — | Yes |
| 773-242 | CHICGOZN06 | 9329 | — | Yes |
| 773-244 | CHICGOZN04 | 9329 | — | — |
| 773-247 | CHICGOZN06 | 9329 | — | — |
| 773-248 | CHICGOZN04 | 9329 | — | — |
| 773-252 | CHICGOZN04 | 9329 | — | — |
| 773-254 | CHICGOZN06 | 9329 | — | — |
| 773-256 | CHICGOZN07 | 9329 | — | Yes |
| 773-257 | CHICGOZN06 | 9329 | — | Yes |
| 773-260 | CHICGOZN10 | 9329 | — | Yes |
| 773-261 | CHICGOZN05 | 9329 | — | Yes |
| 773-262 | CHICGOZN02 | 9329 | — | — |
| 773-264 | CHICGOZN10 | 9329 | — | — |
| 773-265 | CHICGOZN06 | 9329 | — | — |
| 773-267 | CHICGOZN02 | 9329 | — | — |
| 773-268 | CHICGOZN07 | 9329 | — | — |
| 773-271 | CHICGOZN02 | 9329 | — | — |
| 773-273 | CHICGOZN02 | 9329 | — | Yes |
| 773-274 | CHICGOZN02 | 9329 | — | — |
| 773-275 | CHICGOZN02 | 9329 | — | — |
| 773-276 | CHICGOZN04 | 9329 | — | — |
| 773-277 | CHICGOZN06 | 9329 | — | Yes |
| 773-278 | CHICGOZN04 | 9329 | — | — |
| 773-279 | CHICGOZN02 | 9329 | — | Yes |
| 773-281 | CHICGOZN04 | 9329 | — | — |
| 773-282 | CHICGOZN03 | 9329 | — | — |
| 773-283 | CHICGOZN03 | 9329 | — | — |
| 773-284 | CHICGOZN08 | 9329 | — | — |
| 773-285 | CHICGOZN07 | 9329 | — | Yes |
| 773-286 | CHICGOZN03 | 9329 | — | — |
| 773-287 | CHICGOZN05 | 9329 | — | — |
| 773-288 | CHICGOZN07 | 9329 | — | Yes |
| 773-291 | CHICGOZN10 | 9329 | — | — |
| 773-292 | CHICGOZN04 | 9329 | — | — |
| 773-293 | CHICGOZN02 | 9329 | — | Yes |
| 773-296 | CHICGOZN04 | 9329 | — | — |
| 773-298 | CHICGOZN10 | 9329 | — | — |
| 773-324 | CHICGOZN07 | 9329 | — | — |
| 773-325 | CHICGOZN04 | 9329 | — | — |
| 773-327 | CHICGOZN04 | 9329 | — | — |
| 773-334 | CHICGOZN02 | 9329 | — | — |
| 773-338 | CHICGOZN02 | 9329 | — | — |
| 773-342 | CHICGOZN04 | 9329 | — | — |
| 773-348 | CHICGOZN04 | 9329 | — | — |
| 773-356 | CHICGOZN09 | 9329 | — | — |
| 773-361 | CHICGOZN07 | 9329 | — | — |
| 773-363 | CHICGOZN07 | 9329 | — | — |
| 773-371 | CHICGOZN07 | 9329 | — | Yes |
| 773-373 | CHICGOZN07 | 9329 | — | Yes |
| 773-374 | CHICGOZN09 | 9329 | — | — |
| 773-375 | CHICGOZN09 | 9329 | — | — |
| 773-376 | CHICGOZN06 | 9329 | — | — |
| 773-378 | CHICGOZN05 | 9329 | — | Yes |
| 773-379 | CHICGOZN05 | 9329 | — | Yes |
| 773-380 | CHICGOZN03 | 9329 | — | Yes |
| 773-381 | CHICGOZN02 | 9329 | — | — |
| 773-384 | CHICGOZN04 | 9329 | — | — |
| 773-385 | CHICGOZN05 | 9329 | — | — |
| 773-388 | CHICGOZN04 | 9329 | — | — |
| 773-394 | CHICGOZN04 | 9329 | — | Yes |
| 773-395 | CHICGOZN04 | 9329 | — | Yes |
| 773-399 | CHICGOZN03 | 9329 | — | Yes |
| 773-404 | CHICGOZN04 | 9329 | — | — |
| 773-427 | CHICGOZN03 | 9329 | — | Yes |
| 773-429 | CHICGOZN10 | 9329 | — | — |
| 773-434 | CHICGOZN08 | 9329 | — | — |
| 773-436 | CHICGOZN08 | 9329 | — | — |
| 773-444 | CHICGOZN03 | 9329 | — | Yes |
| 773-445 | CHICGOZN10 | 9329 | — | — |
| 773-451 | CHICGOZN07 | 9329 | — | Yes |
| 773-462 | CHICGOZN11 | 9329 | — | Yes |
| 773-463 | CHICGOZN02 | 9329 | — | — |
| 773-465 | CHICGOZN02 | 9329 | — | — |
| 773-467 | CHICGOZN03 | 9329 | — | Yes |
| 773-468 | CHICGOZN10 | 9329 | — | — |
| 773-471 | CHICGOZN08 | 9329 | — | — |
| 773-472 | CHICGOZN04 | 9329 | — | — |
| 773-473 | CHICGOZN05 | 9329 | — | — |
| 773-476 | CHICGOZN08 | 9329 | — | — |
| 773-477 | CHICGOZN04 | 9329 | — | — |
| 773-478 | CHICGOZN02 | 9329 | — | — |
| 773-479 | CHICGOZN05 | 9329 | — | — |
| 773-481 | CHICGOZN03 | 9329 | — | — |
| 773-483 | CHICGOZN07 | 9329 | — | Yes |
| 773-486 | CHICGOZN04 | 9329 | — | — |
| 773-487 | CHICGOZN07 | 9329 | — | Yes |
| 773-488 | CHICGOZN07 | 9329 | — | — |
| 773-489 | CHICGOZN04 | 9329 | — | — |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.