Phone numbers in Oak Ridge, Tennessee
Oak Ridge has 21 phone prefixes in area code 865.
Biggest holders: AT&T (local phone), Teleport Communications America, Windstream (PAETEC). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 29%
- Internet / business phone carrier 67%
- Phone company 5%
Every prefix in Oak Ridge
Search the first six digits of a number in this list. If it's here, the number started in Oak Ridge with the carrier shown. If it isn't, check the Tennessee page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 865-220 | AT&T (local phone) | Local phone company | – |
| 865-241 | Teleport Communications America | Internet / business phone carrier | – |
| 865-272 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 865-275 | Intrado Communications | Phone company | 2002 |
| 865-276 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 865-294 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 865-298 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 865-303 | MCImetro (Verizon Business) | Internet / business phone carrier | 2024 |
| 865-341 | Teleport Communications America | Internet / business phone carrier | 2018 |
| 865-425 | AT&T (local phone) | Local phone company | – |
| 865-434 | MCImetro (Verizon Business) | Internet / business phone carrier | 2024 |
| 865-481 | AT&T (local phone) | Local phone company | – |
| 865-482 | AT&T (local phone) | Local phone company | – |
| 865-483 | AT&T (local phone) | Local phone company | – |
| 865-515 | Teleport Communications America | Internet / business phone carrier | 2026 |
| 865-535 | Teleport Communications America | Internet / business phone carrier | – |
| 865-574 | Teleport Communications America | Internet / business phone carrier | – |
| 865-576 | Teleport Communications America | Internet / business phone carrier | – |
| 865-685 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 865-813 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 865-835 | AT&T (local phone) | Local phone company | 2006 |
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.