All assignees
800 prefixes in 773 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 773-500 | CHICGOZN10 | 224C | 2023-06-15 | Yes |
| 773-501 | CHICGOZN03 | 6529 | 2001-02-12 | — |
| 773-502 | CHICGOZN01 | 6333 | — | — |
| 773-503 | CHICGOZN10 | 6529 | 2004-11-17 | Yes |
| 773-504 | CHICGOZN01 | 6534 | — | — |
| 773-505 | CHICGOZN01 | 6333 | — | — |
| 773-506 | CHICGOZN02 | 9329 | — | — |
| 773-507 | CHICGOZN03 | 6529 | 2001-02-14 | Yes |
| 773-508 | CHICGOZN02 | 9329 | — | — |
| 773-509 | CHICGOZN02 | 9329 | — | — |
| 773-510 | CHICGOZN03 | 6529 | 2002-04-04 | — |
| 773-511 | XXXXXXXXXX | MULT | — | — |
| 773-512 | CHICGOZN03 | 6529 | 2004-10-13 | Yes |
| 773-513 | CHICGOZN01 | 6534 | — | Yes |
| 773-514 | CHICGOZN09 | 6534 | 2023-10-16 | Yes |
| 773-515 | CHICGOZN01 | 6333 | — | Yes |
| 773-516 | CHICGOZN02 | 063E | — | Yes |
| 773-517 | CHICGOZN01 | 6529 | — | — |
| 773-518 | CHICGOZN01 | 6333 | — | Yes |
| 773-519 | CHICGOZN01 | 6333 | — | Yes |
| 773-520 | CHICGOZN01 | 6333 | — | — |
| 773-521 | CHICGOZN06 | 9329 | — | Yes |
| 773-522 | CHICGOZN06 | 9329 | — | — |
| 773-523 | CHICGOZN06 | 9329 | — | — |
| 773-524 | CHICGOZN04 | 6115 | — | Yes |
| 773-525 | CHICGOZN04 | 9329 | — | — |
| 773-526 | CHICGOZN08 | 829J | 2001-04-12 | Yes |
| 773-527 | CHICGOZN03 | 6115 | — | Yes |
| 773-528 | CHICGOZN04 | 9329 | — | — |
| 773-529 | CHICGOZN04 | 9329 | — | — |
| 773-530 | CHICGOZN09 | 318J | 2004-12-30 | Yes |
| 773-531 | CHICGOZN03 | 6529 | — | Yes |
| 773-532 | CHICGOZN01 | 6534 | — | Yes |
| 773-533 | CHICGOZN06 | 9329 | — | — |
| 773-534 | CHICGOZN06 | 9329 | — | — |
| 773-535 | CHICGOZN06 | 9329 | — | — |
| 773-536 | CHICGOZN07 | 9329 | — | Yes |
| 773-537 | CHICGOZN04 | 460K | 2004-05-24 | Yes |
| 773-538 | CHICGOZN07 | 9329 | — | Yes |
| 773-539 | CHICGOZN02 | 9329 | — | — |
| 773-540 | CHICGOZN03 | 6529 | 2004-12-28 | Yes |
| 773-541 | CHICGOZN02 | 6115 | — | Yes |
| 773-542 | CHICGOZN06 | 9329 | — | Yes |
| 773-543 | CHICGOZN04 | 6529 | 2007-10-26 | Yes |
| 773-544 | CHICGOZN01 | 6529 | — | — |
| 773-545 | CHICGOZN03 | 9329 | — | — |
| 773-546 | CHICGOZN10 | 9329 | — | Yes |
| 773-547 | CHICGOZN01 | 6534 | — | — |
| 773-548 | CHICGOZN07 | 9329 | — | Yes |
| 773-549 | CHICGOZN04 | 9329 | — | — |
| 773-550 | CHICGOZN01 | 6333 | — | — |
| 773-551 | CHICGOZN03 | 6534 | — | — |
| 773-552 | CHICGOZN01 | 6529 | — | Yes |
| 773-553 | CHICGOZN06 | 9329 | — | Yes |
| 773-554 | CHICGOZN03 | 6529 | 2009-07-01 | Yes |
| 773-555 | DIR ASST | MULT | — | — |
| 773-556 | CHICGOZN03 | 6529 | — | Yes |
| 773-557 | CHICGOZN03 | 829J | — | Yes |
| 773-558 | CHICGOZN03 | 6333 | 2007-01-15 | Yes |
| 773-559 | CHICGOZN03 | 6529 | 2005-01-10 | Yes |
| 773-560 | CHICGOZN06 | 7136 | 2021-12-15 | Yes |
| 773-561 | CHICGOZN02 | 9329 | — | — |
| 773-562 | CHICGOZN03 | 6529 | — | Yes |
| 773-563 | CHICGOZN10 | 6529 | 2005-10-19 | Yes |
| 773-564 | CHICGOZN02 | 7136 | — | Yes |
| 773-565 | CHICGOZN06 | 460K | 2004-05-21 | Yes |
| 773-566 | CHICGOZN01 | 6630 | — | — |
| 773-567 | CHICGOZN03 | 5562 | 2005-04-22 | Yes |
| 773-568 | CHICGOZN10 | 9329 | — | — |
| 773-569 | CHICGOZN03 | 9329 | — | Yes |
| 773-570 | CHICGOZN11 | 6115 | — | Yes |
| 773-571 | CHICGOZN07 | 6333 | 2007-02-20 | Yes |
| 773-572 | CHICGOZN04 | 6115 | — | Yes |
| 773-573 | CHICGOZN07 | 6333 | — | Yes |
| 773-574 | CHICGOZN10 | 6529 | 2006-03-21 | Yes |
| 773-575 | CHICGOZN03 | 6534 | — | — |
| 773-576 | CHICGOZN01 | 6534 | — | — |
| 773-577 | CHICGOZN03 | 829J | 2001-04-12 | Yes |
| 773-578 | CHICGOZN01 | 6534 | — | Yes |
| 773-579 | CHICGOZN06 | 9329 | — | — |
| 773-580 | CHICGOZN03 | 6534 | — | — |
| 773-581 | CHICGOZN08 | 9329 | — | — |
| 773-582 | CHICGOZN08 | 9329 | — | — |
| 773-583 | CHICGOZN02 | 9329 | — | — |
| 773-584 | CHICGOZN06 | 7196 | — | Yes |
| 773-585 | CHICGOZN08 | 9329 | — | — |
| 773-586 | CHICGOZN08 | 9329 | — | — |
| 773-587 | CHICGOZN03 | 6529 | 2007-01-08 | Yes |
| 773-588 | CHICGOZN02 | 9329 | — | — |
| 773-589 | CHICGOZN05 | 9329 | — | Yes |
| 773-590 | CHICGOZN01 | 6333 | — | Yes |
| 773-591 | CHICGOZN01 | 9329 | — | — |
| 773-592 | CHICGOZN03 | 6529 | — | — |
| 773-593 | CHICGOZN01 | 6529 | — | Yes |
| 773-594 | CHICGOZN03 | 9329 | — | — |
| 773-595 | CHICGOZN07 | 6529 | 2006-10-30 | Yes |
| 773-596 | CHICGOZN02 | 829J | 2001-04-12 | Yes |
| 773-597 | CHICGOZN07 | 460K | 2005-01-21 | Yes |
| 773-598 | CHICGOZN04 | 7196 | — | Yes |
| 773-599 | CHICGOZN08 | 224C | — | 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.