The 512 area code covers Austin, Georgetown and 29 more places in Texas.
Area code 512 is in Texas, on Central Time. In the 512 area, phone numbers are given out most in Travis County, then Williamson and Hays counties. It has been in service since 1947. 737 covers the same area, so two neighbours can have different area codes.
- Where
- 8 counties in Texas, mostly Travis County, Williamson County and Hays County
- Time zone
- Central Time
- In service since
- 1947, one of the original area codes
- Shares its area with
- 737 (since 2013)
- Prefixes in use
- 783
- How to dial
- Local calls need all 10 digits: 512-555-0142.
Find out who called you from a 512 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 (512) number is on today, use our free carrier lookup.
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Austin holds 75% of the phone prefixes in area code 512.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 783 prefixes in use shows where 512 numbers are actually given out.
- Austin585 prefixes, 75%
- Georgetown29 prefixes, 4%
- San Marcos26 prefixes, 3%
- Bastrop19 prefixes, 2%
- Leander12 prefixes, 2%
- Lockhart11 prefixes, 1%
- Burnet8 prefixes, 1%
- Taylor7 prefixes, <1%
Also served: Kyle, Rockdale, Lampasas and Buda and 19 smaller places.
Southwestern Bell (AT&T) holds the most phone number prefixes in area code 512: 272 of 783.
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 783 prefixes in use in 512 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 | 272 | 35% |
| AT&T MobilityMobile network | 98 | 13% |
| T-MobileMobile network | 70 | 9% |
| Level 3 (Lumen)Lumen's business and wholesale network | 66 | 8% |
| FrontierLandline company | 37 | 5% |
| BandwidthSupplies numbers to VoIP and app-based phone services | 17 | 2% |
| 26 other carriers | 223 | 28% |
67% 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.
512 has been split 2 times and overlaid once since 1947.
1947
512 is one of the original North American area codes.
1992
On November 1, 1992, 210 splits off and takes part of the 512 area.
1999
On February 13, 1999, 361 splits off and takes part of the 512 area.
2013
On July 1, 2013, 737 is added on top of 512, so new numbers here can get either code.
A 512 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 512 are 210, 254 and 979.
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 512.
Where is area code 512?
512 covers Austin, Georgetown, San Marcos and Bastrop and 27 more places in Texas. In the 512 area, phone numbers are given out most in Travis County, then Williamson and Hays counties.
What state is area code 512 in?
Texas. 512 is a Texas area code on Central Time.
What cities use area code 512?
The places holding the most 512 prefixes are Austin, Georgetown, San Marcos, Bastrop, Leander, Lockhart, Burnet and Taylor, out of 31 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 512?
No single phone company owns 512. NANPA's records show Southwestern Bell (AT&T) holds the most 512 prefixes, 272 of 783, 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 512 in?
512 is on Central Time.
When did area code 512 start?
512 is one of the original North American area codes, in service since 1947.
Is 512 the same area as 737?
Yes. 737 (since 2013) covers the same ground as 512. 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 512 number?
Local calls need all 10 digits: 512-555-0142.
Is 512 a toll-free number?
No. 512 is a regular area code for Austin and Georgetown 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 512?
The closest are 210/726 (San Antonio, Texas), 254 (Waco, Texas), 979 (Bryan, Texas) and 830 (New Braunfels, Texas), measured between the centres of each area.
Who called me from a 512 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 512 a scam?
512 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.