337
Area code
Statusin service
Introduced1999-10-11
JurisdictionLA, US
Local dialing10D
Time zoneCentral
Last verified2026-09-17
Utilization 77.9% of assignable prefixes assigned
As of 09/17/2026
0%617 of ~792 assignable NXX values (200–999 excl. N11)100%
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-01-09, most recent 2026-03-27.
Area codes serve rate-center geographies, not municipal boundaries. “LA” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 143 | 23.2% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC - GA | 98 | 15.9% |
| 03 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - LA | 53 | 8.6% |
| 04 | PAETEC ITEL, LLC | 34 | 5.5% |
| 05 | BRIGHTSPEED OF LOUISIANA, LLC | 33 | 5.3% |
| 06 | ONVOY, LLC - LA | 28 | 4.5% |
| 07 | METROPCS, INC. | 25 | 4.1% |
| 08 | LEVEL 3 COMMUNICATIONS, LLC - LA | 24 | 3.9% |
| 09 | COMCAST IP PHONE, LLC | 22 | 3.6% |
| 10 | VOICESTREAM GSM I, LLC | 18 | 2.9% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 1999-08-25 NANP-Split of 318 Numbering Plan Area (NPA) in Louisiana; introduction of NPA 337 split
- 1999-10-11Area code 337 entered service (created from 318).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2021-01-08 | PL-556 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Lifeline) – supersedes PL-544 |
| 2020-08-17 | PL-544 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline |
| 1999-08-25 | PL-188 ↗ | NANP-Split of 318 Numbering Plan Area (NPA) in Louisiana; introduction of NPA 337 |