Area Code 210
Texas
Area code 210 serves Texas, primarily San Antonio, in the Central Time (CT) time zone. It has served the region since 01-Nov-1992.
Overlay Area Code
This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.
This area code shares its geographic region with: area code 726 (San Antonio).
In service since: 01-Nov-1992
Area Code Splits
Parts of this area code’s original geographic region were later assigned new area codes through splits. When a split occurs, some customers in the original area code region are assigned the new area code.
Split into: area code 830 (New Braunfels), area code 956 (Laredo).
Demographics & Economics
- Total Population
- 2,447,240
- Population Density
- 346 people/sq miabove U.S. average (U.S.: 93 people/sq mi)
- Median Household Income
- $70,571near U.S. median (U.S.: $75,144)
- Poverty Rate
- 13.9%above U.S. average (U.S.: 11.5%)
- Unemployment Rate
- 5.3%above U.S. average (U.S.: 3.6%)
- Education Attainment
- Bachelor's Degree+31.2%near U.S. average (U.S.: 33.7%)High School or Lower31.3%
Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.
See how this area code compares to all US area codes in the income ranking and density ranking.
Time Zone
- Central Time (CT)
NANPA Relief Status
According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.
Source: NANPA NPA Relief Planning Reports · See all relief planning statuses
Current Time
Prefix Utilization
Geographic Coverage
State
TX
Major Cities
- San Antonio
- Schertz
- Timberwood Park
- Cibolo
- Converse
- Live Oak
- Leon Valley
- Selma
- Scenic Oaks
- Fair Oaks Ranch
- Helotes
- Kirby
- Alamo Heights
- Lackland AFB
- Windcrest
- Sandy Oaks
- Terrell Hills
- Cross Mountain
- Garden Ridge
- Castle Hills
- Shavano Park
- Hollywood Park
- St. Hedwig
- Balcones Heights
and 9 more cities
Historical Timeline of Area Code 210
Area code 210 was created on November 1, 1992, when 512 was split to give San Antonio its own area code. After rapid exhaustion forced a three-way split in 1997 creating 830 and 956, the 726 overlay was activated in 2017 to provide additional numbering capacity. Area code 210 has undergone seven significant changes since its establishment, making it one of the most actively managed numbering plan areas in Texas. Source: Wikipedia.
Key milestones:
- 1947: 512 assigned as one of Texas' original four area codes (214, 512, 713, 915) when the North American Numbering Plan was created, covering south-central Texas including San Antonio.
- November 1, 1992: 210 created in geographic split from 512. The new NPA included San Antonio, the Hill Country, and the Rio Grande Valley. Austin retained 512 despite San Antonio being larger, sparing state agencies renumbering costs. Authorized by NANPA IL-92-03-068.
- 1996: NANPA declared extraordinary NPA-specific conservation procedures for 210 due to rapid number exhaustion within four years of creation, driven by San Antonio's growth and cellular/pager proliferation.
- July 7, 1997: Three-way split of 210. Bexar County stayed in 210; suburbs and Hill Country became 830, completely surrounding 210; Rio Grande Valley became 956. San Antonio residents changed numbers for the second time in a decade.
- June 2015: Planning began for an overlay area code to relieve 210 exhaustion. NANPA projected 210 would exhaust by mid-2018.
- July 21, 2016: Texas PUC approved 726 overlay for 210. Source: Texas PUC.
- October 23, 2017: 726 numbers first assigned. Permissive 10-digit dialing began March 2017; mandatory September 23, 2017. Source: NANPA PL-495.
The 1992 split was the last time any of Texas' original four 1947 area codes was divided, with 512 being the final original code to undergo relief. Area code 512 now serves Austin and is overlaid by 737.
Regulatory History
Area code 210 has undergone five significant regulatory events over 25 years, from its creation in 1992 through the 726 overlay activation in 2017. Source: Texas PUC
| Year | Event | Docket | Regulatory Action & Impact |
|---|---|---|---|
| 1992 | NPA creation | IL-92-03-068 | NANPA Informational Letter authorized the geographic split of 512 into 512 and 210, effective November 1, 1992. The 210 NPA initially covered San Antonio, the Hill Country, and the Rio Grande Valley. (NANPA) |
| 1996 | Conservation procedures | Extraordinary Conservation | NANPA declared extraordinary NPA-specific conservation procedures for the 210 NPA due to rapid number exhaustion within four years of creation, driven by San Antonio's growth and cellular and pager proliferation. (Wikipedia) |
| 1997 | Three-way split | NANP-Split of 210 | Three-way split of 210 creating 830 (suburbs and Hill Country) and 956 (Rio Grande Valley). Most of Bexar County stayed in 210, which became an enclave code. (Wikipedia) |
| 2016 | 726 overlay approval | PUCT Order (Jul 21, 2016) | Texas PUC approved the 726 overlay for the 210 numbering plan area. Permissive 10-digit dialing began March 2017; mandatory September 2017; 726 numbers assigned from October 23, 2017. (Texas PUC) |
| 2016 | 726 code assignment | PL-495 | NANPA assigned 726 as overlay area code for the 210 NPA in San Antonio. Code 726 translates to SAN on the telephone keypad. (NANPA PL-495) |
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 210).
| County | Population | Share |
|---|---|---|
| Bexar, TX | 2,039,765 | 83.3% |
| Comal, TX | 96,630 | 3.9% |
| Medina, TX | 96,163 | 3.9% |
| Guadalupe, TX | 89,356 | 3.7% |
| Wilson, TX | 75,529 | 3.1% |
| Bandera, TX | 28,585 | 1.2% |
| Atascosa, TX | 21,212 | 0.9% |
Area Code 210 Family Tree
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All Descendants
Area code 210 was originally assigned in 01-Nov-1992 to serve TX. Over the years, it has generated 3 descendant area codes through a combination of geographic splits and overlays as demand for telephone numbers grew.
Call Context
This area code covers a metropolitan region in TX with moderate to high population density, centered on San Antonio and surrounding communities.
Nearby Area Codes
Area codes geographically closest to 210.
Other Area Codes in Texas
Area codes that also serve Texas, linked for easy comparison.