Area Code Overview

Area code 323 is a geographic telephone area code in California that went into service on June 13, 1998. The geographic regions covered by this area code overlay has a population of approximately 3,983,297.

Overlay and Dialing Rules

Area Code: 323
State: California
Type: General Purpose Code
In Service Date: June 13, 1998
Overlay Complex: 213/323/738
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 323

This area code is ranked 21st out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 4th out of 39.

6,942,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 323

Total assigned 6,942,000

Wireless

3,092,000 assigned

44.54%

Wireline and VoIP

3,531,000 assigned

50.86%

Other / Unclassified

319,000 assigned

4.60%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 323

Estimated assigned wireless phone numbers: 3,092,000

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

T-Mobile 2,054,000 (66.43%)

AT&T Wireless 535,000 (17.30%)

Verizon Wireless 483,000 (15.62%)

33 WIRELESS INC. 20,000 (0.65%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 323

Estimated assigned wireline and VoIP phone numbers: 3,531,000

AT&T 1,767,000 (50.04%)

Bandwidth 686,000 (19.43%)

Onvoy 460,000 (13.03%)

Lumen 195,000 (5.52%)

TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 130,000 (3.68%)

Peerless Network 97,000 (2.75%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC 58,000 (1.64%)

Spectrum 45,000 (1.27%)

UTILITY TELECOM GROUP, LLC - CA 36,000 (1.02%)

PAETEC ITEL, LLC 16,000 (0.45%)

Telnyx 15,000 (0.42%)

TERRA NOVA TELECOM INC. 11,000 (0.31%)

Other / Unclassified Assigned Numbering in Area Code 323

Estimated assigned other or unclassified phone numbers: 319,000

SPOK, INC. 70,000 (21.94%)

AMERICAN MESSAGING SERVICES, LLC 60,000 (18.81%)

NORTH COUNTY COMMUNICATION CORPORATION - CA 60,000 (18.81%)

TELEPORT COMMUNICATIONS AMERICA, LLC - CA 33,000 (10.34%)

U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 26,000 (8.15%)

CURATEL, LLC - CA 23,000 (7.21%)

HD CARRIER LLC 18,000 (5.64%)

IP HORIZON LLC 11,000 (3.45%)

SHELCOMM 10,000 (3.13%)

TON80 COMMUNICATIONS, LLC 5,000 (1.57%)

CONNECTTO COMMUNICATIONS, INC. - CA 1,000 (0.31%)

DMR COMMUNICATIONS INC. - CA 1,000 (0.31%)

Cities and Towns in Area Code 323

Compton, California Los Angeles, California Montebello, California

These geographic regions are also served by area codes 213 and 738.

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 323, 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