Phone numbers in Milford, Connecticut
Milford has 20 phone prefixes in area codes 203, 475.
Biggest holders: AT&T (local phone), Onvoy, Cablevision Lightpath. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 40%
- Internet / business phone carrier 60%
Every prefix in Milford
Search the first six digits of a number in this list. If it's here, the number started in Milford with the carrier shown. If it isn't, check the Connecticut page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 203-283 | Cablevision Lightpath | Internet / business phone carrier | – |
| 203-301 | AT&T (local phone) | Local phone company | – |
| 203-306 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 203-647 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 203-693 | Cablevision Lightpath | Internet / business phone carrier | 2010 |
| 203-701 | AT&T (local phone) | Local phone company | – |
| 203-713 | Onvoy | Internet / business phone carrier | – |
| 203-783 | AT&T (local phone) | Local phone company | – |
| 203-874 | AT&T (local phone) | Local phone company | – |
| 203-876 | AT&T (local phone) | Local phone company | – |
| 203-877 | AT&T (local phone) | Local phone company | – |
| 203-878 | AT&T (local phone) | Local phone company | – |
| 203-882 | AT&T (local phone) | Local phone company | – |
| 203-951 | Teleport Communications America | Internet / business phone carrier | – |
| 475-271 | Onvoy | Internet / business phone carrier | 2020 |
| 475-294 | Onvoy | Internet / business phone carrier | 2021 |
| 475-327 | TON80 Communications | Internet / business phone carrier | 2022 |
| 475-357 | Onvoy | Internet / business phone carrier | 2024 |
| 475-549 | Bandwidth | Internet / business phone carrier | 2015 |
| 475-996 | Onvoy | Internet / business phone carrier | 2026 |
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.