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210 Area Code: San Antonio, Texas — Coverage, Time Zone & Phone Numbers
Area code 210 covers San Antonio and Bexar County, Texas. Learn about coverage, time zone, and how to get a local 210 number.
By Josh Whitaker
Area code 210 serves San Antonio and Bexar County in south-central Texas. As the seventh-largest city in the United States, San Antonio is a major hub for military, healthcare, tourism, and cybersecurity. If you need a local presence in this region, you can get a 210 phone number through Telnyx.
What area does 210 cover?
The 210 area code covers San Antonio and its innermost suburbs, primarily within Bexar County. It is one of the smallest geographic area codes in Texas but serves one of the largest populations.
| City | County | Population | Notes |
|---|---|---|---|
| San Antonio | Bexar | ~1,500,000 | 7th largest US city |
| Alamo Heights | Bexar | ~8,500 | Affluent enclave |
| Converse | Bexar | ~30,000 | Northeast suburb |
| Live Oak | Bexar | ~17,000 | Near Randolph AFB |
| Universal City | Bexar | ~21,000 | Adjacent to Randolph AFB |
| Leon Valley | Bexar | ~12,500 | Northwest suburb |
| Kirby | Bexar | ~8,500 | East side |
| Windcrest | Bexar | ~6,000 | Northeast suburb |
| Castle Hills | Bexar | ~4,500 | North central |
| Balcones Heights | Bexar | ~3,300 | Medical center area |
For complete coverage details, see the NANPA area code map.
210 area code time zone
Area code 210 is in the Central Time Zone (CT). During standard time, this is UTC-6 (CST). During daylight saving time, it shifts to UTC-5 (CDT).
History of the 210 area code
The 210 area code was created in 1992 when it split from the 512 area code (which now serves Austin). Originally, 210 covered a much larger area of South Texas, but subsequent splits created area codes 830 (1997) and 956 (1997).
In 2017, the 726 area code was added as an overlay to the same geographic region. Both 210 and 726 now serve San Antonio and Bexar County, so new phone lines may be assigned either area code. This means 10-digit dialing (area code + number) is required for all local calls. For regulatory details, visit the Public Utility Commission of Texas.
Why the 210 region matters for business
San Antonio has one of the most diverse economies in Texas, with major strengths in military, healthcare, tourism, and emerging technology sectors:
Military & Defense
- Joint Base San Antonio — largest joint base in the DoD
- Lackland AFB — basic training for all Air Force/Space Force
- Fort Sam Houston — Army medical training
- Randolph AFB — pilot training
- Major defense contractors and cybersecurity firms
Healthcare & Biosciences
- South Texas Medical Center — largest medical complex in South Texas
- University Health System
- Methodist Healthcare
- Texas Biomedical Research Institute
Tourism & Hospitality
- The Alamo — most visited site in Texas
- River Walk — 15+ million visitors annually
- SeaWorld San Antonio
- Six Flags Fiesta Texas
Technology & Cybersecurity
- Growing tech hub with focus on cybersecurity
- Rackspace Technology headquarters
- Port San Antonio tech campus
A local 210 number helps businesses build trust with customers in this region. Calls from local area codes have higher answer rates than unfamiliar or toll-free numbers.
Get a 210 phone number
Telnyx offers local phone numbers in the 210 area code. You get:
- Instant provisioning — activate numbers in minutes, not days
- Flexible pricing — pay only for what you use
- Voice, SMS, and MMS — full communication capabilities
- API access — programmatic number management
- Number portability — bring your existing 210 numbers to Telnyx
Browse available 210 numbers or contact sales to discuss your needs.
Neighboring area codes
| Area Code | Region | Major City | Relationship to 210 |
|---|---|---|---|
| 726 | San Antonio | San Antonio | Overlay (same area) |
| 830 | South Texas Hill Country | New Braunfels | North/West (split from 210 in 1997) |
| 512 | Austin | Austin | North (210 split from 512 in 1992) |
| 956 | Rio Grande Valley | McAllen | South (split from 210 in 1997) |
| 361 | Corpus Christi | Corpus Christi | Southeast |
| 832/713/281 | Houston | Houston | East |
Frequently asked questions
What area code is 210? Area code 210 serves San Antonio and Bexar County in south-central Texas.
What time zone is 210? Central Time (CT) — UTC-6 standard, UTC-5 during daylight saving.
Is 210 the same as 726? Yes, 726 is an overlay that covers the same geographic area as 210. Both area codes serve San Antonio and Bexar County.
Do I need to dial the area code for local calls? Yes. Since the 726 overlay was introduced in 2017, all calls require 10-digit dialing (area code + 7-digit number).
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