All assignees
759 prefixes in 605 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 605-502 | PIERRE | 073H | 2021-10-07 | Yes |
| 605-503 | RAPID CITY | 490J | 2021-12-30 | Yes |
| 605-504 | SIOUX FLS | 9631 | 2016-08-31 | Yes |
| 605-505 | PARKSTON | 6534 | 2005-10-31 | Yes |
| 605-506 | WORTHING | 490J | 2022-08-02 | Yes |
| 605-508 | RAPID CITY | 6701 | 2025-11-12 | Yes |
| 605-509 | SIOUX FLS | 9631 | — | — |
| 605-510 | RAPID CITY | 6534 | 2021-10-13 | Yes |
| 605-511 | XXXXXXXXXX | MULT | — | — |
| 605-512 | NEWUNDERWD | 490J | 2023-01-30 | Yes |
| 605-513 | RAPID CITY | 732J | 2023-02-10 | Yes |
| 605-514 | HURON | 078J | 2023-03-14 | Yes |
| 605-515 | WALL | 6569 | 2003-08-13 | Yes |
| 605-516 | MURDO | 6569 | 2003-08-13 | Yes |
| 605-517 | CUSTER | 6569 | 2003-08-13 | Yes |
| 605-518 | SIOUX FLS | 318J | 2023-04-13 | Yes |
| 605-519 | RAPID CITY | 6569 | 2012-05-08 | Yes |
| 605-520 | WATERTOWN | 6534 | — | — |
| 605-521 | SIOUX FLS | 6701 | 2001-09-26 | Yes |
| 605-522 | YANKTON | 5562 | 2021-06-23 | Yes |
| 605-523 | CANOVA | 1669 | — | — |
| 605-524 | MCINTOSH | 9631 | — | Yes |
| 605-525 | LK PRESTON | 363J | 2019-08-26 | Yes |
| 605-526 | WALL LAKE | 1684 | — | — |
| 605-527 | ARTESIAN | 1676 | — | — |
| 605-528 | HARTFORD | 1684 | — | Yes |
| 605-529 | BALTIC | 1642 | — | — |
| 605-530 | FLANDREAU | 6534 | — | Yes |
| 605-531 | FLANDREAU | 6569 | 2022-06-23 | Yes |
| 605-532 | CLARK | 1651 | — | — |
| 605-533 | SOLIDGERWD | 1631 | — | — |
| 605-534 | FLANDREAU | 9631 | — | Yes |
| 605-535 | OELRICHS | 1659 | — | — |
| 605-537 | ROSHOLT | 1680 | — | — |
| 605-538 | DUPREE | 1647 | — | — |
| 605-539 | WESIGTNSPG | 1680 | — | — |
| 605-540 | NOSIOUX CY | 5180 | 2006-12-28 | Yes |
| 605-541 | BIGSTONECY | 7076 | 2008-07-09 | — |
| 605-542 | ELKTON | 1651 | — | — |
| 605-543 | CROOKS | 1642 | — | — |
| 605-544 | MILESVILLE | 1659 | — | — |
| 605-545 | RAPID CITY | 6534 | 2001-01-16 | Yes |
| 605-546 | IROQUOIS | 9631 | — | Yes |
| 605-547 | W HAWARDEN | 1109 | — | Yes |
| 605-548 | BALTIC | 7076 | 2009-04-24 | — |
| 605-549 | SPEARFISH | 106F | 2010-02-12 | Yes |
| 605-550 | MITCHELL | 5180 | 2005-02-16 | Yes |
| 605-551 | BRITTON | 6534 | 2010-10-20 | Yes |
| 605-552 | CENTERVL | 7024 | — | — |
| 605-553 | SIOUX FLS | 7229 | 2004-07-14 | Yes |
| 605-554 | HURON | 7076 | 2006-10-10 | — |
| 605-555 | DIR ASST | MULT | — | — |
| 605-556 | MADISON | 7076 | 2001-05-17 | Yes |
| 605-557 | CLEARFIELD | 1686 | — | — |
| 605-558 | CANTON | 7076 | 2001-05-17 | — |
| 605-559 | SPEARFISH | 7076 | 2006-10-06 | — |
| 605-560 | BROOKINGSR | 920F | 2016-12-09 | Yes |
| 605-561 | STURGIS | 7076 | 2006-10-06 | — |
| 605-562 | PINE RIDGE | 870F | 2010-01-19 | — |
| 605-563 | CENTERVL | 1660 | — | — |
| 605-564 | SOHETTINGR | 1607 | — | — |
| 605-565 | WEST AKRON | 1109 | — | Yes |
| 605-566 | SPEARFISH | 162G | — | Yes |
| 605-567 | HAYES | 1659 | — | — |
| 605-568 | BELLEFORCH | 7076 | 2006-10-06 | — |
| 605-569 | BELLEFORCH | 6569 | 2008-01-31 | Yes |
| 605-570 | HURON | 6569 | 2018-04-02 | Yes |
| 605-571 | SPEARFISH | 7076 | — | Yes |
| 605-572 | ARMOUR | 6569 | 2014-06-13 | Yes |
| 605-573 | FLANDREAU | 7024 | — | — |
| 605-574 | HILL CITY | 9631 | — | Yes |
| 605-575 | SIOUX FLS | 9631 | — | — |
| 605-576 | SOUTH LADD | 1607 | — | — |
| 605-577 | LONG LAKE | 1685 | — | — |
| 605-578 | SPEARFISH | 9631 | — | Yes |
| 605-579 | HOWARD | 6534 | 2005-06-08 | Yes |
| 605-580 | SPEARFISH | 6569 | — | Yes |
| 605-581 | MOBRIDGE | 6534 | 2022-05-20 | Yes |
| 605-582 | BRANDON | 1657 | — | — |
| 605-583 | SCOTLAND | 1686 | — | — |
| 605-584 | SPEARFISH | 9631 | — | — |
| 605-585 | NOSIOUX CY | 6529 | 2007-03-28 | — |
| 605-586 | NUNDA | 1651 | — | — |
| 605-587 | NO BRISTOW | 1576 | — | — |
| 605-588 | WEBSTER | 7076 | 2003-09-16 | Yes |
| 605-589 | TYNDALL | 1660 | — | — |
| 605-590 | WEBSTER | 6569 | 2008-03-20 | Yes |
| 605-591 | SPEARFISH | 6569 | — | Yes |
| 605-592 | BROOKINGS | 6534 | 2009-12-31 | Yes |
| 605-593 | RAPID CITY | 5180 | — | Yes |
| 605-594 | GARRETSON | 1657 | — | — |
| 605-595 | SIOUX FLS | 7421 | — | Yes |
| 605-596 | TULARE | 1680 | — | — |
| 605-597 | MITCHELL | 9631 | 2010-07-20 | Yes |
| 605-598 | FAULKTON | 1680 | — | — |
| 605-599 | CAVOUR | 9631 | — | Yes |
| 605-600 | RAPID CITY | 965H | 2019-01-28 | Yes |
| 605-601 | SIOUX FLS | 506J | 2020-10-23 | Yes |
| 605-602 | WATERTOWN | 6701 | 2025-08-28 | Yes |
| 605-603 | RAPID CITY | 106F | 2026-05-08 | 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.