Area code 512

Area code 512 Austin, Texas

Area code 512 is one of the original 1947 area codes, in Texas, with numbers assigned in Austin, Georgetown, San Marcos and 27 more places. It’s 11:11 PM there now.

State: Texas29 area codes in Texas
Time zone: Central11:11 PM there now
Exchanges: 78530 places
Overlay: 737Same area, 10-digit dialing

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Where area code 512 is

Numbers in 512 are assigned to 30 places in 10 counties: Williamson County, Hays County, Bastrop County, Travis County, Caldwell County, Guadalupe County, plus 4 more.

Austin holds most of them: 75% of the exchanges.

Austin585
Georgetown29
San Marcos26
Bastrop19
Leander12
Lockhart11
Burnet8
Taylor7
Kyle6
Rockdale6
Lampasas6
Buda5
Wimberley5
Elgin4
Smithville4
Jarrell4
Dripping Springs4
Buchanan Dam4
Paige3
Bertram3
Milano3
Liberty Hill3
Lometa3
Hutto3

Phone companies in 512

785 blocks of numbers in 512 are held by 33 phone companies. The most belong to AT&T (273), AT&T Mobility (98) and T-Mobile (84).

A mix: about 30% wireless, 42% local phone and cable and 28% other carriers, including internet phone services.

A block’s holder is the company it was first assigned to; numbers can move to other carriers since.

History and overlays

512 has been in service since 1947, when the first North American area codes were set up.

737 (since 2013) shares the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.

16 new exchanges were assigned since 2021, the latest in November 2024.

Calling 512

It’s 11:11 PM Central time in 512 right now.

From elsewhere in the U.S., dial 1, 512 and the 7-digit number; inside the area, all 10 digits too.

Nearby area codes

Texas has 29 area codes: 210, 214, 254, 281, 325, 346, 361, 409, 430, 432, 469, 512, 621, 682, 713, 726, 737, 806, 817, 830, 832, 903, 915, 936, 940, 945, 956, 972 and 979.

From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.

Map of the 512 area code

Map of the 512 area code around Austin, Georgetown and San Marcos, Texas.

Interactive map © OpenStreetMap contributors

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Questions about 512

Where is area code 512?

In Texas, covering Austin, Georgetown and San Marcos and other places across 10 counties.

What time zone is 512 in?

Central time. It was 11:11 PM there when this page loaded.

Is 512 an overlay?

Yes. 737 serves the same area, so dial all 10 digits for local calls.

Which phone companies have 512 numbers?

33 companies hold blocks; the most belong to AT&T, AT&T Mobility and T-Mobile. About 30% of blocks are wireless.

Is 512 running out of numbers?

Not on record. 16 new exchanges have been assigned since 2021.