Phone numbers in Newtown, Connecticut
Newtown has 11 phone prefixes in area codes 203, 475.
Biggest holders: AT&T (local phone), Bandwidth, Onvoy. 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 55%
- Phone company 9%
Every prefix in Newtown
Search the first six digits of a number in this list. If it's here, the number started in Newtown with the carrier shown. If it isn't, check the Connecticut page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 203-270 | AT&T (local phone) | Local phone company | – |
| 203-304 | Teleport Communications America | Internet / business phone carrier | – |
| 203-364 | AT&T (local phone) | Local phone company | – |
| 203-426 | AT&T (local phone) | Local phone company | – |
| 203-491 | Bandwidth | Internet / business phone carrier | 2010 |
| 475-297 | Bandwidth | Internet / business phone carrier | 2021 |
| 475-323 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 475-360 | Onvoy | Internet / business phone carrier | 2024 |
| 475-376 | Eon Telecom | Phone company | 2024 |
| 475-444 | Peerless Network Of Connecticut | Internet / business phone carrier | 2013 |
| 475-445 | Onvoy | Internet / business phone carrier | 2020 |
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.