Phone numbers in Sulphur, Louisiana
Sulphur has 15 phone prefixes in area code 337.
Biggest holders: AT&T (local phone), AT&T Mobility, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 33%
- Internet / business phone carrier 33%
Every prefix in Sulphur
Search the first six digits of a number in this list. If it's here, the number started in Sulphur with the carrier shown. If it isn't, check the Louisiana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 337-215 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 337-287 | AT&T Mobility | Mobile carrier | 2001 |
| 337-313 | Level 3 (Lumen) | Internet / business phone carrier | 2003 |
| 337-476 | AT&T Mobility | Mobile carrier | 2010 |
| 337-503 | Windstream (PAETEC) | Internet / business phone carrier | 2005 |
| 337-527 | AT&T (local phone) | Local phone company | – |
| 337-528 | AT&T (local phone) | Local phone company | – |
| 337-533 | AT&T (local phone) | Local phone company | – |
| 337-607 | Level 3 (Lumen) | Internet / business phone carrier | 2016 |
| 337-625 | AT&T (local phone) | Local phone company | – |
| 337-626 | AT&T (local phone) | Local phone company | – |
| 337-674 | TON80 Communications | Internet / business phone carrier | 2022 |
| 337-712 | AT&T Mobility | Mobile carrier | 2024 |
| 337-888 | AT&T Mobility | Mobile carrier | – |
| 337-900 | Onvoy | Internet / business phone carrier | 2015 |
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.