Area code 337: where it is and who calls from it
Area code 337 is in Louisiana.
Louisiana (Lafayette, Lake Charles, Leesville, New Iberia, Opelousas, and most of southwestern Louisiana)
| Where | Louisiana |
|---|---|
| Time zone | Central Time ยท local time |
| In service since | 1999 |
| Overlay | No |
| Prefixes assigned | 599 of 792 possible (76%) |
Where 337 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 337, with how many prefixes each has.
Plus 15 smaller rate centers.
Who holds 337 numbers
- Mobile carrier 33%
- Local phone company 31%
- Internet / business phone carrier 29%
- Paging service 1%
- Phone company 6%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| AT&T (local phone) | Local phone company | 140 | 23% |
| AT&T Mobility | Mobile carrier | 98 | 16% |
| Verizon Wireless | Mobile carrier | 53 | 9% |
| Windstream (PAETEC) | Internet / business phone carrier | 34 | 6% |
| Brightspeed Of Louisiana | Local phone company | 33 | 6% |
| Onvoy | Internet / business phone carrier | 33 | 6% |
| Level 3 (Lumen) | Internet / business phone carrier | 31 | 5% |
| MetroPCS (T-Mobile) | Mobile carrier | 24 | 4% |
| Comcast | Internet / business phone carrier | 22 | 4% |
| T-Mobile (including Sprint) | Mobile carrier | 19 | 3% |
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.
States served: Louisiana.
Other area codes in Louisiana
Got a call from 337?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 337 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.