The 210 area code covers San Antonio in Texas.
Area code 210 is in Texas, on Central Time. In the 210 area, phone numbers are given out in Bexar County. It has been in service since November 1, 1992. 726 covers the same area, so two neighbours can have different area codes.
- Where
- Bexar County, Texas
- Time zone
- Central Time
- In service since
- November 1, 1992
- Shares its area with
- 726 (since 2017)
- Prefixes in use
- 784
- How to dial
- Local calls need all 10 digits: 210-555-0142.
Find out who called you from a 210 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (210) number is on today, use our free carrier lookup.
Works for US & Canada numbers. Enter a 10-digit number, e.g. (415) 555-0132.
Free & rate-limited. No signup required to try.
San Antonio holds every phone prefix in area code 210.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 784 prefixes in use shows where 210 numbers are actually given out.
- San Antonio784 prefixes, 100%
Southwestern Bell (AT&T) holds the most phone number prefixes in area code 210: 280 of 784.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 784 prefixes in use in 210 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| Southwestern Bell (AT&T)AT&T's landline company | 280 | 36% |
| AT&T MobilityMobile network | 129 | 16% |
| T-MobileMobile network | 94 | 12% |
| Level 3 (Lumen)Lumen's business and wholesale network | 37 | 5% |
| BandwidthSupplies numbers to VoIP and app-based phone services | 18 | 2% |
| SpokPaging network | 13 | 2% |
| 26 other carriers | 213 | 27% |
71% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
210 has been split 2 times and overlaid once since 1992.
1992
210 starts on November 1, 1992, split off from 512.
1997
On July 7, 1997, 830 and 956 split off and take part of the 210 area.
2017
On October 23, 2017, 726 is added on top of 210, so new numbers here can get either code.
A 210 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 210 are 830, 512 and 361.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
Texas has 28 other area codes.
These are the questions people ask most about area code 210.
Where is area code 210?
210 covers San Antonio in Texas. In the 210 area, phone numbers are given out in Bexar County.
What state is area code 210 in?
Texas. 210 is a Texas area code on Central Time.
Which phone company owns area code 210?
No single phone company owns 210. NANPA's records show Southwestern Bell (AT&T) holds the most 210 prefixes, 280 of 784, followed by AT&T Mobility and T-Mobile. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 210 in?
210 is on Central Time.
When did area code 210 start?
210 went into service on November 1, 1992, when it was split off from 512.
Is 210 the same area as 726?
Yes. 726 (since 2017) covers the same ground as 210. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 210 number?
Local calls need all 10 digits: 210-555-0142.
Is 210 a toll-free number?
No. 210 is a regular area code for San Antonio in Texas, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 210?
The closest are 830 (New Braunfels, Texas), 512/737 (Austin, Texas), 361 (Corpus Christi, Texas) and 979 (Bryan, Texas), measured between the centres of each area.
Who called me from a 210 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 210 a scam?
210 is a real Texas area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.