All assignees
525 prefixes in 307 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 307-890 | FREEDOM | 013B | — | — |
| 307-895 | CHEYENNE | 506J | 2022-03-31 | Yes |
| 307-896 | WBLLFOURCH | 9631 | — | — |
| 307-899 | CODY | 6010 | — | — |
| 307-900 | GLENDO | 965H | 2020-06-10 | Yes |
| 307-910 | CHEYENNE | 450F | 2021-04-23 | Yes |
| 307-911 | XXXXXXXXXX | MULT | — | — |
| 307-920 | CHEYENNE | 6529 | — | Yes |
| 307-921 | THERMOPOLS | 6566 | — | Yes |
| 307-922 | ROCK SPG | 6566 | — | Yes |
| 307-939 | WRIGHT | 9636 | — | Yes |
| 307-941 | NEWCASTLE | 6566 | — | Yes |
| 307-949 | NEWCASTLE | 6566 | — | Yes |
| 307-950 | — | — | ||
| 307-958 | — | — | ||
| 307-959 | — | — | ||
| 307-970 | — | — | ||
| 307-976 | — | — | ||
| 307-977 | LARAMIE | 013B | — | — |
| 307-988 | — | — | ||
| 307-990 | LANDER | 939H | 2023-04-04 | Yes |
| 307-995 | CASPER | 9636 | — | Yes |
| 307-996 | CHEYENNE | 450F | — | Yes |
| 307-998 | SHERIDAN | 450F | 2024-06-14 | Yes |
| 307-999 | MORAN | 073H | 2017-02-28 | 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.