UNION TELEPHONE COMPANY
65 prefixes in 307 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 307-260 | BIG PINEY | 013B | — | — |
| 307-270 | COKEVILLE | 013B | — | — |
| 307-280 | FARSON | 013B | — | — |
| 307-320 | RAWLINS | 013B | — | — |
| 307-329 | SARATOGA | 013B | — | — |
| 307-330 | LANDER | 013B | — | — |
| 307-339 | HANNA | 013B | — | — |
| 307-345 | LANDER | 013B | — | — |
| 307-350 | ROCK SPG | 013B | — | — |
| 307-354 | ROCK SPG | 013B | 2001-03-27 | — |
| 307-360 | PINEDALE | 013B | — | — |
| 307-377 | CASPER | 013B | — | — |
| 307-380 | BAGGS | 013B | — | — |
| 307-390 | LABARGE | 013B | — | — |
| 307-450 | DUBOIS | 013B | — | — |
| 307-477 | CHEYENNE | 013B | — | — |
| 307-520 | MEDICINBOW | 013B | — | — |
| 307-540 | JEFFREY CY | 013B | — | — |
| 307-541 | MORAN | 013B | — | — |
| 307-549 | OLDFATHFUL | 013B | — | — |
| 307-567 | GILLETTE | 013B | — | — |
| 307-600 | COKEVILLE | 013B | — | — |
| 307-701 | CHEYENNE | 013B | 2002-12-27 | — |
| 307-702 | CASPER | 013B | 2002-12-27 | — |
| 307-703 | LARAMIE | 013B | 2002-12-27 | — |
| 307-704 | GILLETTE | 013B | 2002-12-27 | — |
| 307-705 | ROCK SPG | 013B | 2003-06-16 | — |
| 307-706 | SHERIDAN | 013B | 2002-12-27 | — |
| 307-707 | GREENRIVER | 013B | 2003-06-26 | — |
| 307-708 | EVANSTON | 013B | 2003-06-16 | — |
| 307-709 | RIVERTON | 013B | 2003-06-16 | — |
| 307-710 | RAWLINS | 013B | 2003-06-16 | — |
| 307-712 | CODY | 013B | 2002-12-27 | — |
| 307-713 | JACKSON | 013B | 2003-06-16 | — |
| 307-714 | LANDER | 013B | 2003-06-16 | — |
| 307-715 | TORRINGTON | 013B | 2002-12-27 | — |
| 307-716 | POWELL | 013B | 2002-12-27 | — |
| 307-717 | DOUGLAS | 013B | 2002-12-27 | — |
| 307-718 | WORLAND | 013B | 2002-12-27 | — |
| 307-719 | BUFFALO | 013B | 2002-12-27 | — |
| 307-720 | WHEATLAND | 013B | 2002-12-27 | — |
| 307-722 | THERMOPOLS | 013B | 2002-12-27 | — |
| 307-723 | KEMMERER | 013B | 2003-06-16 | — |
| 307-724 | CASPER | 013B | 2003-06-16 | — |
| 307-727 | KEMMERER | 013B | — | — |
| 307-728 | SHOSHONI | 013B | — | — |
| 307-730 | JACKSON | 013B | — | — |
| 307-731 | LOVELL | 013B | 2002-12-27 | — |
| 307-740 | JACKSON | 013B | — | — |
| 307-741 | GLENROCK | 013B | 2002-12-27 | — |
| 307-744 | NEWCASTLE | 013B | 2002-12-27 | — |
| 307-747 | MT VIEW | 013B | 2003-06-16 | — |
| 307-749 | PINEDALE | 013B | 2003-10-20 | — |
| 307-759 | LUSK | 013B | 2003-10-20 | — |
| 307-779 | WHEATLAND | 013B | 2003-10-20 | — |
| 307-780 | MT VIEW | 013B | — | — |
| 307-790 | SUNDANCE | 013B | 2003-12-18 | — |
| 307-798 | ROCK RIVER | 013B | 2007-11-06 | — |
| 307-799 | EVANSTON | 013B | — | — |
| 307-850 | RIVERTON | 013B | — | — |
| 307-858 | RIVERTON | 013B | — | — |
| 307-870 | GREENRIVER | 013B | — | — |
| 307-884 | AFTON | 013B | — | — |
| 307-890 | FREEDOM | 013B | — | — |
| 307-977 | LARAMIE | 013B | — | — |
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.