The 210 area code is the primary phone code for San Antonio, Texas, the second-largest city in the state and home to the Alamo. Created in 1992 in a split from the Austin-based 512 code, it now shares the San Antonio metro with the 726 overlay. If a 210 number has appeared on your caller ID, this guide explains where it comes from, how to dial it, and how to stay safe from spoofed calls.
Quick Summary: Area Code 210 at a Glance
| Detail | Information |
|---|---|
| Area Code | 210 |
| State | Texas (TX) |
| Major Cities | San Antonio (and inner Bexar County) |
| Time Zone | Central Time (CT) |
| Country Code | +1 (USA) |
| Overlay Codes | 726 (co-located) |
Geographic Coverage & Major Cities
Area code 210 covers the city of San Antonio and the inner ring of Bexar County in South-Central Texas. It anchors the urban core of the metro, while the surrounding Hill Country and rural areas use the neighboring 830 code.
Cities and communities served by the 210 area code include:
- San Antonio – the second-largest city in Texas, home to the Alamo and the River Walk
- Alamo Heights & Terrell Hills – established communities within the city
- Leon Valley & Balcones Heights – inner-suburban enclaves
- Inner Bexar County – the dense residential and military areas around the city
As the founding San Antonio code, a 210 number is prized as a mark of authentic, long-established roots in the Alamo City.
A Brief History of Area Code 210
Area code 210 was created in 1992 in a geographic split from the 512 code, giving San Antonio its own dedicated code as the region grew. In 1997, the surrounding Hill Country and southern counties split off into the 830 code, leaving 210 with the San Antonio metro. In 2017, the 726 overlay was added across the same area, cementing mandatory 10-digit dialing.
Time Zone & Best Time to Call
Numbers in the 210 area code use Central Time (CT). The region observes Daylight Saving Time, shifting from CST (UTC-6) to CDT (UTC-5) between March and November each year.
How to Dial Phone Numbers in Area Code 210
Because 210 is overlaid by 726 across San Antonio, the region requires 10-digit dialing on every call.
Calling within the United States or Canada
- 10-digit dialing: Always include the area code – 210-XXX-XXXX.
- 11-digit dialing: You can also dial 1-210-XXX-XXXX; the leading 1 is the NANP country code.
Calling from outside the United States
- Format: [exit code] + 1 + 210 + XXX + XXXX
- From the UK, Europe, or most of Asia/Africa: 00 1 210 XXX XXXX
- From any mobile phone worldwide: +1 210 XXX XXXX
Is Area Code 210 a Scam? Safety & Protection Tips
Area code 210 is a legitimate Texas area code – a call from it is not fraudulent by default. However, because 210 is the well-known San Antonio code, scammers frequently spoof it, faking the caller ID so their number appears to come from a trusted local line. Neighbor spoofing, which mimics the first six digits of your own number, is especially common.
Common scam tactics linked to this region
| Scam type | What to watch for |
|---|---|
| Government impersonation | Callers posing as the IRS or SSA threatening arrest or fines |
| Bank & card fraud alerts | Claims of “suspicious activity” seeking your account details |
| Military & veteran-benefit scams | Fake VA or benefits calls targeting the large military community |
| Utility shut-off threats | Demands for immediate payment to avoid disconnection |
How to report, block, and look up 210 callers
- Never share personal or financial details with an unexpected caller, however urgent they sound.
- Block the number using your phone’s built-in call-blocking feature or a reputable call-screening app.
- Look up the number with a trusted reverse phone lookup before returning any call.
- Report it to the FTC at reportfraud.ftc.gov and register at DoNotCall.gov.
Nearby & Related Area Codes in Texas
Area code 210 shares and borders several other Texas codes:
- 726 – the overlay that shares San Antonio with 210
- 512 & 737 – Austin, from which 210 originally split (see our 512 area code and 737 area code guides)
- 830 – the Texas Hill Country and border region around San Antonio
- 361 – Corpus Christi and the Coastal Bend to the southeast
Explore more codes across the state on our Texas area codes hub, or browse every prefix in our US area codes directory.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border Texas:
Frequently Asked Questions About Area Code 210
Where is the 210 area code located?
Area code 210 covers San Antonio and inner Bexar County in South-Central Texas. It operates on Central Time and is overlaid by area code 726.
What is the difference between 210 and 726?
There is no geographic difference. 726 is an overlay covering the exact same San Antonio territory as 210; it was added in 2017 simply to supply more phone numbers.
Is 210 a landline or cell phone area code?
Both. Area code 210 serves landlines, mobile phones, and VoIP numbers throughout the San Antonio area.
Should I answer a call from an unknown 210 number?
If you are not expecting the call, let it go to voicemail. Legitimate callers leave a message, while spoofed or robocall numbers usually will not. Verify any unfamiliar number with a reverse lookup before calling back.
Related 210 Guides
- Is a 210 call safe? Read Is area code 210 a scam? Spam & safety guide.
- Local coverage: see the San Antonio area code guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.