North American Numbers Source-cited · ownership disclosed
Area code
210
In service
United States · since 1992

San Antonio

Covers the city of San Antonio and its innermost suburbs, essentially Bexar County. Forms an overlay with 726.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
San Antonio
Type
geographic
Status
in service
In service since
1992
Projected exhaust
2072 Q1

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 210 is

San Antonio and its innermost suburbs (Bexar County), Texas.

Communities served wholly or partly by 210:

San AntonioAlamo HeightsCastle HillsConverseKirbySchertzUniversal City

Representative; primarily Bexar County plus small portions of adjacent counties.

B · Relationships

How it relates to other codes

The codes 210 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Split from · 1992 512 Austin 210 was created Nov 1, 1992 in a split from 512.
Spawned · 1997 830 New Braunfels 830 (the "ring" around San Antonio) split off from 210 in 1997.
Spawned · 1997 956 Laredo 956 (Rio Grande Valley) split off from 210 in 1997.
Overlay · 2017 726 San Antonio (overlay) 726 was added as an all-services overlay of 210 in 2017.
What's changing. Active overlay with 726. Mandatory 10-digit dialing since late September 2017.
C · History

How 210 got here

1992-11-01
Created in a split from area code 512, serving San Antonio, the Hill Country and the Rio Grande Valley.
Source: Wikipedia (Area codes 210 and 726)
1997-07-07
Three-way split: Bexar County kept 210 while 830 and 956 were carved off.
Source: Wikipedia (Area codes 210 and 726)
2017-10
Area code 726 activated as an overlay; mandatory 10-digit dialing began late September 2017.
Source: Wikipedia (Area codes 210 and 726)
D · Capacity

How full it is

Prefixes assigned
800
Prefixes available
0
Thousands-blocks assigned
4,084

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 210 with another code →
Sources
Wikipedia ↗
Area codes 210 and 726
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.