817
Area code
TX
United States geographic area code, in service since 1953-01-01. Part of the 682/817 overlay complex — ten-digit dialing required.
Statusin service
Introduced1953-01-01
JurisdictionTX, US
Local dialing10D
Time zoneCentral
Last verified2026-09-17
Utilization 100.6% of assignable prefixes assigned
As of 09/17/2026
0%797 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 2001-01-16, most recent 2026-03-02.
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 | 302 | 37.9% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC - IL | 88 | 11% |
| 03 | T-MOBILE USA, INC. | 54 | 6.8% |
| 04 | LEVEL 3 COMMUNICATIONS, LLC - TX | 45 | 5.6% |
| 05 | ONVOY, LLC - TX | 43 | 5.4% |
| 06 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 30 | 3.8% |
| 07 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 26 | 3.3% |
| 08 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 26 | 3.3% |
| 09 | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 25 | 3.1% |
| 10 | SPOK, INC. | 16 | 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- 2000-03-01 NPA 682 to Overlay NPA 817 (Texas)
- 1996-11-15 Declaration of Jeopardy Situation in NPA 817 (Texas) jeopardy
- 1953-01-01Area code 817 entered service.
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2000-03-01 | PL-219 ↗ | NPA 682 to Overlay NPA 817 (Texas) |
| 1999-07-27 | PL-186 ↗ | Extraordinary NPA-Specific Jeopardy Conservation Procedures Announced for 817 NPA (Texas) |