737
Area code
TX
United States geographic area code, in service since 2013-07-01. Part of the 512/737 overlay complex — ten-digit dialing required.
Statusin service
Introduced2013-07-01
JurisdictionTX, US
Local dialing10D
Time zoneCentral
Last verified2026-09-17
Utilization 43.7% of assignable prefixes assigned
As of 09/17/2026
0%346 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 2013-02-19, most recent 2026-09-16.
Area codes serve rate-center geographies, not municipal boundaries. “TX” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | ONVOY, LLC - TX | 81 | 23.4% |
| 02 | T-MOBILE USA, INC. | 33 | 9.5% |
| 03 | NEW CINGULAR WIRELESS PCS, LLC - IL | 29 | 8.4% |
| 04 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 28 | 8.1% |
| 05 | FRACTEL, LLC | 26 | 7.5% |
| 06 | BANDWIDTH.COM CLEC, LLC - TX | 21 | 6.1% |
| 07 | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 13 | 3.8% |
| 08 | TON80 COMMUNICATIONS, LLC | 9 | 2.6% |
| 09 | MULTIPLE OCN LISTING | 9 | 2.6% |
| 10 | FOREMOST TELECOMMUNICATIONS CORPORATION - TX | 7 | 2% |
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- 2012-08-01 NPA 737 to Overlay NPA 512 (Texas)
- 2013-07-01Area code 737 entered service (created from 512).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2012-08-01 | PL-438 ↗ | NPA 737 to Overlay NPA 512 (Texas) |
| 2001-05-02 | PL-276 ↗ | Suspension of 512/737 NPA Relief (Texas) |
| 2000-07-05 | PL-233 ↗ | NPA 737 to Overlay NPA 512 (Texas) |