Area Code Overview

Area code 210 is a geographic telephone area code in Texas that went into service on November 1, 1992. The geographic regions covered by this area code overlay has a population of approximately 2,127,737.

Overlay and Dialing Rules

Area Code: 210
State: Texas
Type: General Purpose Code
In Service Date: November 1, 1992
Overlay Complex: 210/726
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 210

This area code is ranked 32nd out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 4th out of 28.

6,754,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 210

Total assigned 6,754,000

Wireless

3,272,000 assigned

48.45%

Wireline and VoIP

3,194,000 assigned

47.29%

Other / Unclassified

288,000 assigned

4.26%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 210

Estimated assigned wireless phone numbers: 3,272,000

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

AT&T Wireless 1,436,000 (43.89%)

T-Mobile 1,410,000 (43.09%)

Verizon Wireless 424,000 (12.96%)

EVOLVE CELLULAR, INC. 1,000 (0.03%)

Optimum Mobile 1,000 (0.03%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 210

Estimated assigned wireline and VoIP phone numbers: 3,194,000

AT&T 1,434,000 (44.90%)

Onvoy 395,000 (12.37%)

Bandwidth 367,000 (11.49%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC 253,000 (7.92%)

LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 243,000 (7.61%)

Spectrum 241,000 (7.55%)

Lumen 166,000 (5.20%)

PAETEC ITEL, LLC 31,000 (0.97%)

Peerless Network 25,000 (0.78%)

MATRIX TELECOM, LLC. S/I/I TNCI - TX 20,000 (0.63%)

Telnyx 6,000 (0.19%)

NUSO 4,000 (0.13%)

Other / Unclassified Assigned Numbering in Area Code 210

Estimated assigned other or unclassified phone numbers: 288,000

SPOK, INC. 140,000 (48.61%)

TELEPORT COMMUNICATIONS AMERICA, LLC - TX 83,000 (28.82%)

AMERICAN MESSAGING SERVICES, LLC 40,000 (13.89%)

GRANDE COMMUNICATIONS NETWORKS, INC. - TX 10,000 (3.47%)

USFON, INC. - TX 8,000 (2.78%)

HD CARRIER LLC 2,000 (0.69%)

IP HORIZON LLC 2,000 (0.69%)

AIRESPRING, INC. 1,000 (0.35%)

WESTEL, INC. - TX 1,000 (0.35%)

XO TEXAS, INC. 1,000 (0.35%)

Cities and Towns in Area Code 210

San Antonio, Texas

These geographic regions are also served by area code 726.

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 210, 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