All assignees
800 prefixes in 773 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 773-400 | CHICGOZN02 | 9748 | 2001-04-16 | — |
| 773-401 | CHICGOZN01 | 6534 | — | — |
| 773-402 | CHICGOZN01 | 6534 | — | Yes |
| 773-403 | CHICGOZN03 | 6529 | — | Yes |
| 773-404 | CHICGOZN04 | 9329 | — | — |
| 773-405 | CHICGOZN01 | 6333 | — | — |
| 773-406 | CHICGOZN07 | 6529 | — | Yes |
| 773-407 | CHICGOZN03 | 6529 | — | Yes |
| 773-408 | CHICGOZN06 | 6529 | 2009-02-13 | Yes |
| 773-409 | CHICGOZN02 | 7136 | — | Yes |
| 773-410 | CHICGOZN02 | 6529 | — | Yes |
| 773-411 | XXXXXXXXXX | MULT | — | — |
| 773-412 | CHICGOZN03 | 6529 | — | Yes |
| 773-413 | CHICGOZN05 | 7136 | — | Yes |
| 773-414 | CHICGOZN03 | 6529 | 2004-09-07 | Yes |
| 773-415 | CHICGOZN01 | 6333 | — | — |
| 773-416 | CHICGOZN01 | 6529 | — | Yes |
| 773-417 | CHICGOZN05 | 318J | — | Yes |
| 773-418 | CHICGOZN03 | 6529 | — | Yes |
| 773-419 | CHICGOZN01 | 6529 | — | — |
| 773-420 | CHICGOZN07 | 7136 | — | Yes |
| 773-421 | CHICGOZN01 | 6333 | — | Yes |
| 773-422 | CHICGOZN01 | 6333 | — | Yes |
| 773-423 | CHICGOZN02 | 7229 | — | Yes |
| 773-424 | CHICGOZN08 | 7136 | — | Yes |
| 773-425 | CHICGOZN03 | 6529 | — | Yes |
| 773-426 | CHICGOZN03 | 6529 | 2002-01-04 | Yes |
| 773-427 | CHICGOZN03 | 9329 | — | Yes |
| 773-428 | CHICGOZN01 | 6534 | — | — |
| 773-429 | CHICGOZN10 | 9329 | — | — |
| 773-430 | CHICGOZN03 | 6529 | — | Yes |
| 773-431 | CHICGOZN03 | 6534 | 2008-11-05 | Yes |
| 773-432 | CHICGOZN08 | 460K | — | Yes |
| 773-433 | CHICGOZN02 | 6529 | — | Yes |
| 773-434 | CHICGOZN08 | 9329 | — | — |
| 773-435 | CHICGOZN04 | 7229 | — | Yes |
| 773-436 | CHICGOZN08 | 9329 | — | — |
| 773-437 | CHICGOZN09 | 7136 | — | Yes |
| 773-438 | CHICGOZN01 | 6630 | — | — |
| 773-439 | CHICGOZN03 | 8702 | — | Yes |
| 773-440 | CHICGOZN10 | 5562 | — | Yes |
| 773-441 | CHICGOZN03 | 6534 | 2008-08-21 | Yes |
| 773-442 | CHICGOZN02 | 7196 | — | Yes |
| 773-443 | CHICGOZN01 | 6529 | — | — |
| 773-444 | CHICGOZN03 | 9329 | — | Yes |
| 773-445 | CHICGOZN10 | 9329 | — | — |
| 773-446 | CHICGOZN06 | 6115 | — | Yes |
| 773-447 | CHICGOZN01 | 6529 | — | — |
| 773-448 | CHICGOZN07 | 224C | 2025-10-15 | Yes |
| 773-449 | CHICGOZN09 | 8702 | — | Yes |
| 773-450 | CHICGOZN01 | 6534 | — | — |
| 773-451 | CHICGOZN07 | 9329 | — | Yes |
| 773-452 | CHICGOZN01 | 6333 | — | Yes |
| 773-453 | CHICGOZN11 | 7229 | — | Yes |
| 773-454 | CHICGOZN03 | 6529 | — | Yes |
| 773-455 | CHICGOZN11 | 7196 | — | Yes |
| 773-456 | CHICGOZN03 | 6534 | — | — |
| 773-457 | CHICGOZN07 | 6529 | — | Yes |
| 773-458 | CHICGOZN03 | 7196 | — | Yes |
| 773-459 | CHICGOZN01 | 6529 | — | — |
| 773-460 | CHICGOZN05 | 224C | 2026-08-19 | Yes |
| 773-461 | CHICGOZN02 | 6529 | 2022-08-24 | Yes |
| 773-462 | CHICGOZN11 | 9329 | — | Yes |
| 773-463 | CHICGOZN02 | 9329 | — | — |
| 773-464 | CHICGOZN01 | 6630 | — | — |
| 773-465 | CHICGOZN02 | 9329 | — | — |
| 773-466 | CHICGOZN05 | 7229 | — | Yes |
| 773-467 | CHICGOZN03 | 9329 | — | Yes |
| 773-468 | CHICGOZN10 | 9329 | — | — |
| 773-469 | CHICGOZN01 | 6529 | — | — |
| 773-470 | CHICGOZN08 | 7229 | — | Yes |
| 773-471 | CHICGOZN08 | 9329 | — | — |
| 773-472 | CHICGOZN04 | 9329 | — | — |
| 773-473 | CHICGOZN05 | 9329 | — | — |
| 773-474 | CHICGOZN10 | 829J | 2001-04-12 | Yes |
| 773-475 | CHICGOZN06 | 7136 | — | Yes |
| 773-476 | CHICGOZN08 | 9329 | — | — |
| 773-477 | CHICGOZN04 | 9329 | — | — |
| 773-478 | CHICGOZN02 | 9329 | — | — |
| 773-479 | CHICGOZN05 | 9329 | — | — |
| 773-480 | CHICGOZN01 | 6534 | — | — |
| 773-481 | CHICGOZN03 | 9329 | — | — |
| 773-482 | CHICGOZN11 | 829J | 2001-04-12 | Yes |
| 773-483 | CHICGOZN07 | 9329 | — | Yes |
| 773-484 | CHICGOZN07 | 6333 | — | Yes |
| 773-485 | CHICGOZN01 | 6333 | — | — |
| 773-486 | CHICGOZN04 | 9329 | — | — |
| 773-487 | CHICGOZN07 | 9329 | — | Yes |
| 773-488 | CHICGOZN07 | 9329 | — | — |
| 773-489 | CHICGOZN04 | 9329 | — | — |
| 773-490 | CHICGOZN03 | 6534 | — | — |
| 773-491 | CHICGOZN03 | 6529 | — | Yes |
| 773-492 | CHICGOZN08 | 984E | 2011-08-23 | Yes |
| 773-493 | CHICGOZN07 | 9329 | — | Yes |
| 773-494 | CHICGOZN03 | 6529 | 2004-10-13 | Yes |
| 773-495 | CHICGOZN01 | 6529 | — | — |
| 773-496 | CHICGOZN07 | 829J | 2001-04-12 | Yes |
| 773-497 | CHICGOZN01 | 6333 | — | Yes |
| 773-498 | CHICGOZN08 | 7136 | — | Yes |
| 773-499 | CHICGOZN03 | 6529 | 2004-09-28 | Yes |
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.