Phone numbers in Naugatuck, Connecticut
Naugatuck has 11 phone prefixes in area codes 203, 475.
Biggest holders: AT&T (local phone), Peerless Network Of Connecticut, Teleport Communications America. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 9%
- Local phone company 27%
- Internet / business phone carrier 64%
Every prefix in Naugatuck
Search the first six digits of a number in this list. If it's here, the number started in Naugatuck with the carrier shown. If it isn't, check the Connecticut page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 203-490 | Teleport Communications America | Internet / business phone carrier | – |
| 203-632 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 203-714 | Onvoy | Internet / business phone carrier | – |
| 203-720 | AT&T (local phone) | Local phone company | – |
| 203-723 | AT&T (local phone) | Local phone company | – |
| 203-729 | AT&T (local phone) | Local phone company | – |
| 475-212 | Peerless Network Of Connecticut | Internet / business phone carrier | 2012 |
| 475-285 | Bandwidth | Internet / business phone carrier | 2020 |
| 475-406 | T-Mobile (including Sprint) | Mobile carrier | 2026 |
| 475-701 | Peerless Network Of Connecticut | Internet / business phone carrier | 2018 |
| 475-763 | 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.