TX
United States geographic area code, in service since 1947-01-01. Part of the 281/346/621/713/832 overlay complex — ten-digit dialing required.
Created 409. Created 281. Created 832. Overlaid with 281, 346, 621 .
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-01-18, most recent 2026-02-25.
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 | SOUTHWESTERN BELL | 470 | 58.8% |
| 02 | SPOK, INC. | 62 | 7.8% |
| 03 | NEW CINGULAR WIRELESS PCS, LLC - IL | 55 | 6.9% |
| 04 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 38 | 4.8% |
| 05 | ONVOY, LLC - TX | 25 | 3.1% |
| 06 | AERIAL COMMUNICATIONS, INC. | 24 | 3% |
| 07 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 19 | 2.4% |
| 08 | LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 19 | 2.4% |
| 09 | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 13 | 1.6% |
| 10 | LEVEL 3 COMMUNICATIONS, LLC - TX | 11 | 1.4% |
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- 1997-07-01 Declaration of Jeopardy Situation in NPA 713 (Texas) jeopardy
- 1947-01-01Area code 713 entered service.
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2023-12-06 | PL-623 ↗ | NPA 621 to Overlay NPA 281/346/713/832 (Texas) |