Area Code Overview

Area code 310 is a geographic telephone area code in California that went into service on November 2, 1991. The geographic regions covered by this area code overlay has a population of approximately 4,718,810.

Overlay and Dialing Rules

Area Code: 310
State: California
Type: General Purpose Code
In Service Date: November 2, 1991
Overlay Complex: 310/424
Local Dialing Plan: This area requires you to dial 1 and the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 310

This area code is ranked 44th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 7th out of 39.

6,608,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 310

Total assigned 6,608,000

Wireless

2,318,000 assigned

35.08%

Wireline and VoIP

3,756,000 assigned

56.84%

Other / Unclassified

534,000 assigned

8.08%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 310

Estimated assigned wireless phone numbers: 2,318,000

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

T-Mobile 898,000 (38.74%)

AT&T Wireless 777,000 (33.52%)

Verizon Wireless 593,000 (25.58%)

33 WIRELESS INC. 50,000 (2.16%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 310

Estimated assigned wireline and VoIP phone numbers: 3,756,000

AT&T 1,881,000 (50.08%)

Verizon 1,040,000 (27.69%)

Lumen 254,000 (6.76%)

Onvoy 205,000 (5.46%)

Bandwidth 109,000 (2.90%)

PAETEC ITEL, LLC 81,000 (2.16%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC 55,000 (1.46%)

Spectrum 33,000 (0.88%)

UTILITY TELECOM GROUP, LLC - CA 33,000 (0.88%)

TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 29,000 (0.77%)

Peerless Network 18,000 (0.48%)

TERRA NOVA TELECOM INC. 5,000 (0.13%)

Other / Unclassified Assigned Numbering in Area Code 310

Estimated assigned other or unclassified phone numbers: 534,000

SPOK, INC. 240,000 (44.94%)

AMERICAN MESSAGING SERVICES, LLC 110,000 (20.60%)

U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 75,000 (14.04%)

TELEPORT COMMUNICATIONS AMERICA, LLC - CA 63,000 (11.80%)

NORTH COUNTY COMMUNICATION CORPORATION - CA 20,000 (3.75%)

IP HORIZON LLC 13,000 (2.43%)

SHELCOMM 10,000 (1.87%)

CURATEL, LLC - CA 1,000 (0.19%)

EXIANT COMMUNICATIONS LLC 1,000 (0.19%)

INTEGRATED PATH COMMUNICATIONS, LLC - CA 1,000 (0.19%)

Cities and Towns in Area Code 310

Avalon, California Beverly Hills, California Compton, California Culver City, California El Segundo, California Hawthorne, California Inglewood, California Lakewood, California Lomita, California Los Angeles, California Malibu, California Redondo Beach, California San Pedro, California Santa Monica, California Torrance, California

These geographic regions are also served by area code 424.

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 310, 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