Phone numbers in Westport, Connecticut
Westport has 20 phone prefixes in area codes 203, 475.
Biggest holders: AT&T (local phone), AT&T Mobility, MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 10%
- Local phone company 40%
- Internet / business phone carrier 50%
Every prefix in Westport
Search the first six digits of a number in this list. If it's here, the number started in Westport with the carrier shown. If it isn't, check the Connecticut page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 203-216 | AT&T Mobility | Mobile carrier | – |
| 203-221 | AT&T (local phone) | Local phone company | – |
| 203-222 | AT&T (local phone) | Local phone company | – |
| 203-226 | AT&T (local phone) | Local phone company | – |
| 203-227 | AT&T (local phone) | Local phone company | – |
| 203-291 | AT&T (local phone) | Local phone company | – |
| 203-293 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 203-341 | AT&T (local phone) | Local phone company | – |
| 203-349 | Teleport Communications America | Internet / business phone carrier | – |
| 203-429 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 203-451 | AT&T Mobility | Mobile carrier | – |
| 203-454 | AT&T (local phone) | Local phone company | – |
| 203-557 | Cablevision Lightpath | Internet / business phone carrier | – |
| 203-571 | AT&T (local phone) | Local phone company | – |
| 203-635 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 203-682 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 475-363 | Onvoy | Internet / business phone carrier | 2024 |
| 475-471 | Onvoy | Internet / business phone carrier | 2019 |
| 475-666 | Peerless Network Of Connecticut | Internet / business phone carrier | 2016 |
| 475-887 | 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.