Phone numbers in Byram, Connecticut
Byram has 12 phone prefixes in area codes 203, 475.
Biggest holders: Verizon (local phone), Onvoy, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 58%
- Phone company 8%
Every prefix in Byram
Search the first six digits of a number in this list. If it's here, the number started in Byram with the carrier shown. If it isn't, check the Connecticut page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 203-347 | Level 3 (Lumen) | Internet / business phone carrier | 2004 |
| 203-531 | Verizon (local phone) | Local phone company | – |
| 203-532 | Verizon (local phone) | Local phone company | – |
| 203-552 | Verizon (local phone) | Local phone company | – |
| 203-580 | Peerless Network Of Connecticut | Internet / business phone carrier | 2012 |
| 203-660 | Onvoy | Internet / business phone carrier | 2001 |
| 203-681 | Verizon (local phone) | Local phone company | – |
| 203-813 | Tc Systems | Phone company | – |
| 475-252 | Cablevision Lightpath | Internet / business phone carrier | 2018 |
| 475-275 | Onvoy | Internet / business phone carrier | 2016 |
| 475-367 | Onvoy | Internet / business phone carrier | 2024 |
| 475-447 | Onvoy | Internet / business phone carrier | 2021 |
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.