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512 Area Code

Area Code Overview

Area code 512 is a geographic telephone area code in Texas that went into service on January 1, 1947. The geographic regions covered by this area code overlay has a population of approximately 1,970,235.

Overlay and Dialing Rules

  • Area Code: 512
  • State: Texas
  • Type: General Purpose Code
  • In Service Date: January 1, 1947
  • Overlay Complex: 512/737
  • Local Dialing Plan: This area does require you to dial the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 512

This area code is tied for 53rd out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 6th out of 28.

6,533,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 512

Total assigned 6,533,000
Wireless
2,399,000 assigned
36.72%
Wireline and VoIP
3,624,000 assigned
55.47%
Other / Unclassified
510,000 assigned
7.81%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 512

Estimated assigned wireless phone numbers: 2,399,000

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

AT&T Wireless 1,036,000 (43.18%)
T-Mobile 939,000 (39.14%)
Verizon Wireless 389,000 (16.22%)
EVOLVE CELLULAR, INC. 32,000 (1.33%)
Optimum Mobile 3,000 (0.13%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 512

Estimated assigned wireline and VoIP phone numbers: 3,624,000

AT&T 1,500,000 (41.39%)
Onvoy 422,000 (11.64%)
Bandwidth 392,000 (10.82%)
LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 379,000 (10.46%)
Lumen 274,000 (7.56%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 206,000 (5.68%)
Spectrum 205,000 (5.66%)
Verizon 91,000 (2.51%)
Peerless Network 63,000 (1.74%)
CEBRIDGE TELECOM TX , L.P. - TX 29,000 (0.80%)
PAETEC ITEL, LLC 24,000 (0.66%)
Telnyx 18,000 (0.50%)

Other / Unclassified Assigned Numbering in Area Code 512

Estimated assigned other or unclassified phone numbers: 510,000

SPOK, INC. 160,000 (31.37%)
BRIGHTSPEED OF SOUTHERN TEXAS, INC. 110,000 (21.57%)
TELEPORT COMMUNICATIONS AMERICA, LLC - TX 98,000 (19.22%)
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 33,000 (6.47%)
AMERICAN MESSAGING SERVICES, LLC 30,000 (5.88%)
GRANDE COMMUNICATIONS NETWORKS, INC. - TX 27,000 (5.29%)
AUSTIN BESTLINE COMPANY 20,000 (3.92%)
BRIGHTSPEED OF TEXAS, INC. 10,000 (1.96%)
INVOXIO INCORPORATED 10,000 (1.96%)
USFON, INC. - TX 9,000 (1.76%)
IP HORIZON LLC 2,000 (0.39%)
WESTEL, INC. - TX 1,000 (0.20%)

Cities and Towns in Area Code 512

Adamsville, Texas Austin, Texas Bastrop, Texas Bertram, Texas Briggs, Texas Buchanan Dam, Texas Buda, Texas Burnet, Texas Coupland, Texas Dale, Texas Dripping Springs, Texas Elgin, Texas Fentress, Texas Georgetown, Texas Granger, Texas Hutto, Texas Jarrell, Texas Kempner, Texas Kyle, Texas Lampasas, Texas Leander, Texas Liberty, Texas Lockhart, Texas Lometa, Texas Martindale, Texas Mc Dade, Texas Milano, Texas Paige, Texas Rockdale, Texas San Gabriel, Texas San Marcos, Texas Smithville, Texas Taylor, Texas Thorndale, Texas Wimberley, Texas

These geographic regions are also served by area code 737.

How These Figures Were Built

These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 512, not live customer counts.

Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.

They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.

Population data and locality matching provided by GeoNames.

Last refreshed: April 15, 2026 6:22 pm