Area code 307: where it is and who calls from it
Area code 307 is in Wyoming.
Wyoming (all)
| Where | Wyoming |
|---|---|
| Time zone | Mountain Time ยท local time |
| In service since | 1947 |
| Overlay | No |
| Prefixes assigned | 499 of 792 possible (63%) |
Where 307 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 307, with how many prefixes each has.
Plus 32 smaller rate centers.
Who holds 307 numbers
- Mobile carrier 25%
- Local phone company 35%
- Internet / business phone carrier 24%
- Phone company 15%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| CenturyLink / Lumen | Local phone company | 97 | 19% |
| Union Telephone | Local phone company | 65 | 13% |
| Verizon Wireless | Mobile carrier | 60 | 12% |
| AT&T Mobility | Mobile carrier | 49 | 10% |
| Onvoy | Internet / business phone carrier | 41 | 8% |
| Level 3 (Lumen) | Internet / business phone carrier | 27 | 5% |
| Bandwidth | Internet / business phone carrier | 19 | 4% |
| Rt Communications | Phone company | 17 | 3% |
| T-Mobile (including Sprint) | Mobile carrier | 14 | 3% |
| Union Tel | Phone company | 11 | 2% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number.
States served: Wyoming.
Got a call from 307?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 307 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.