TX
United States geographic area code, in service since 1992-11-01. Part of the 210/726 overlay complex — ten-digit dialing required.
Split from 512. Created 830. Created 956. Created 726. Overlaid with 726 .
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-01-29, most recent 2026-07-08.
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 | 281 | 35.1% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC - IL | 129 | 16.1% |
| 03 | T-MOBILE USA, INC. | 94 | 11.8% |
| 04 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 54 | 6.8% |
| 05 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 39 | 4.9% |
| 06 | ONVOY, LLC - TX | 37 | 4.6% |
| 07 | LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 21 | 2.6% |
| 08 | BANDWIDTH.COM CLEC, LLC - TX | 18 | 2.3% |
| 09 | LEVEL 3 COMMUNICATIONS, LLC - TX | 16 | 2% |
| 10 | SPOK, INC. | 13 | 1.6% |
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- 2016-08-23 NPA 726 to Overlay NPA 210 (Texas)
- 1996-12-02 Declaration of Jeopardy Situation in NPA 210 (Texas) jeopardy
- 1992-11-01Area code 210 entered service (created from 512).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2016-08-23 | PL-495 ↗ | NPA 726 to Overlay NPA 210 (Texas) |
| 1997-01-22 | PL-035 ↗ | NANP-Split of 210 (Texas) Numbering Plan Area (NPA) |
| 1992-03-01 | IL-92-03-068 ↗ | NANP-SPLIT OF 512 (SOUTH TEXAS) NUMBERING PLAN AREA (NPA) |