Phone numbers in Sheridan, Wyoming
Sheridan has 17 phone prefixes in area code 307.
Biggest holders: CenturyLink / Lumen, Verizon Wireless, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 29%
- Local phone company 35%
- Internet / business phone carrier 29%
- Phone company 6%
Every prefix in Sheridan
Search the first six digits of a number in this list. If it's here, the number started in Sheridan with the carrier shown. If it isn't, check the Wyoming page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 307-218 | Onvoy | Internet / business phone carrier | 2019 |
| 307-381 | Bandwidth | Internet / business phone carrier | 2021 |
| 307-429 | Bandwidth | Internet / business phone carrier | 2013 |
| 307-435 | T-Mobile (including Sprint) | Mobile carrier | 2025 |
| 307-461 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 307-533 | Verizon Wireless | Mobile carrier | 2006 |
| 307-655 | CenturyLink / Lumen | Local phone company | – |
| 307-672 | CenturyLink / Lumen | Local phone company | – |
| 307-673 | CenturyLink / Lumen | Local phone company | – |
| 307-674 | CenturyLink / Lumen | Local phone company | – |
| 307-675 | Advanced Communications Technology | Phone company | 2003 |
| 307-683 | CenturyLink / Lumen | Local phone company | – |
| 307-706 | Union Telephone | Local phone company | 2002 |
| 307-751 | AT&T Mobility | Mobile carrier | – |
| 307-752 | Verizon Wireless | Mobile carrier | – |
| 307-763 | Verizon Wireless | Mobile carrier | – |
| 307-998 | Onvoy | Internet / business phone carrier | 2024 |
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. Source: NANPA central office code records, 2026-10-10.