INTERSTATE TELECOM COOP, INC. - SD
27 prefixes in 605 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 605-272 | GARY | 1651 | — | — |
| 605-345 | WEBSTER | 1651 | — | — |
| 605-483 | WENTWORTH | 1651 | — | — |
| 605-489 | CHESTER | 1651 | — | — |
| 605-532 | CLARK | 1651 | — | — |
| 605-542 | ELKTON | 1651 | — | — |
| 605-586 | NUNDA | 1651 | — | — |
| 605-623 | REVILLO | 1651 | — | — |
| 605-625 | BRYNTWLWLK | 1651 | — | — |
| 605-628 | BRYNTWLWLK | 1651 | — | — |
| 605-629 | WHITE | 1651 | — | — |
| 605-676 | STOCKHOLM | 1651 | — | — |
| 605-693 | BROOKINGSR | 1651 | — | — |
| 605-756 | SOUTHSHORE | 1651 | — | — |
| 605-758 | FLORENCE | 1651 | — | — |
| 605-783 | HAYTI | 1651 | — | — |
| 605-784 | BRADLEY | 1651 | — | — |
| 605-785 | LAKENORDEN | 1651 | — | — |
| 605-793 | CASTLEWOOD | 1651 | — | — |
| 605-794 | TORONTO | 1651 | — | — |
| 605-795 | GOODWIN | 1651 | — | — |
| 605-826 | SINAI | 1651 | — | — |
| 605-832 | ASTORIA | 1651 | — | — |
| 605-873 | ESTELLINE | 1651 | — | — |
| 605-874 | CLEAR LAKE | 1651 | — | — |
| 605-876 | BRANDT | 1651 | — | — |
| 605-947 | WAUBAY | 1651 | — | — |
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.