Phone numbers in Georgetown, Connecticut
Georgetown has 6 phone prefixes in area codes 203, 475.
Biggest holders: Level 3 (Lumen), AT&T (local phone), Csc Voice. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 17%
- Internet / business phone carrier 83%
Every prefix in Georgetown
Search the first six digits of a number in this list. If it's here, the number started in Georgetown with the carrier shown. If it isn't, check the Connecticut page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 203-493 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 203-544 | AT&T (local phone) | Local phone company | – |
| 203-587 | Csc Voice | Internet / business phone carrier | – |
| 475-325 | Bandwidth | Internet / business phone carrier | 2014 |
| 475-501 | Onvoy | Internet / business phone carrier | 2020 |
| 475-644 | 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.