Phone numbers in Washington, Connecticut
Washington has 4 phone prefixes in area codes 860, 959.
Biggest holders: Teleport Communications America, AT&T (local phone), Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 25%
- Internet / business phone carrier 75%
Every prefix in Washington
Search the first six digits of a number in this list. If it's here, the number started in Washington with the carrier shown. If it isn't, check the Connecticut page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 860-619 | Teleport Communications America | Internet / business phone carrier | – |
| 860-868 | AT&T (local phone) | Local phone company | – |
| 959-214 | Level 3 (Lumen) | Internet / business phone carrier | 2020 |
| 959-466 | TON80 Communications | Internet / business phone carrier | 2022 |
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.