Texas · Central Time
210 Area Code
Area code 210 is in Texas, serving San Antonio and most of Bexar County in south-central Texas. It is in the Central Time zone. It shares its territory with overlay code 726, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 210 area code?
210 is a Texas area code covering San Antonio and most of Bexar County in south-central Texas. In the wider directory it sits in the South region.
Cities in the 210 area code
- San Antonio
- Converse
- Universal City
- Live Oak
- Leon Valley
- Alamo Heights
- Helotes
- Kirby
- Windcrest
- Selma
- Castle Hills
- Balcones Heights
Counties served by 210
Bexar County.
Time zone note: Almost all of Texas is Central; far-west El Paso is Mountain.
210 overlay codes and dialing
The 210 territory is covered by an overlay of 2 area codes: 210, 726. All of them serve the same geographic area, and the original code is 210. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 210 area code
210 went into service on November 1, 1992, created when it was split from 512. It serves San Antonio and the surrounding part of Texas, and today shares its territory with overlay code 726. For how codes are created, split, and overlaid, see how area codes work.
Is 210 a scam or spam risk?
210 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 210 number on your screen is no guarantee the caller is in San Antonio, TX or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Texas area codes
Explore more
See every code in Texas, compare codes across the South region, or view all Central Time codes. You can also browse the 2XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
210 area code FAQ
Where is the 210 area code?
The 210 area code is in Texas, covering San Antonio and most of Bexar County in south-central Texas, in the South region.
What cities are in the 210 area code?
Cities in the 210 area code include San Antonio, Converse, Universal City, Live Oak, Leon Valley, Alamo Heights, Helotes, Kirby, Windcrest and Selma.
What time zone is 210 in?
210 is in the Central Time zone. Almost all of Texas is Central; far-west El Paso is Mountain.
What is the overlay for the 210 area code?
210 shares its territory with 726. Both codes (210, 726) serve the same area, so 10-digit dialing is required for every call.
When did the 210 area code start?
210 went into service on November 1, 1992.
Do I have to dial 10 digits for 210?
Yes. Because 210 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 210 a toll-free or premium code?
No. 210 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.