Area Code Overview

Area code 657 is a geographic telephone area code in California that went into service on September 23, 2008. The geographic regions covered by this area code overlay has a population of approximately 1,774,980.

Overlay and Dialing Rules

Area Code: 657
State: California
Type: General Purpose Code
In Service Date: September 23, 2008
Overlay Complex: 657/714
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 657

This area code is tied for 48th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 8th out of 39.

6,572,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 657

Total assigned 6,572,000

Wireless

5,137,000 assigned

78.16%

Wireline and VoIP

1,249,000 assigned

19.00%

Other / Unclassified

186,000 assigned

2.83%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 657

Estimated assigned wireless phone numbers: 5,137,000

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

Verizon Wireless 4,223,000 (82.21%)

T-Mobile 551,000 (10.73%)

AT&T Wireless 363,000 (7.07%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 657

Estimated assigned wireline and VoIP phone numbers: 1,249,000

Onvoy 454,000 (36.35%)

Bandwidth 293,000 (23.46%)

Peerless Network 104,000 (8.33%)

Lumen 91,000 (7.29%)

TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 77,000 (6.16%)

Spectrum 53,000 (4.24%)

Commio 33,000 (2.64%)

AT&T 32,000 (2.56%)

PAETEC ITEL, LLC 22,000 (1.76%)

Telnyx 22,000 (1.76%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC 18,000 (1.44%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 11,000 (0.88%)

Other / Unclassified Assigned Numbering in Area Code 657

Estimated assigned other or unclassified phone numbers: 186,000

TELEPORT COMMUNICATIONS AMERICA, LLC - CA 53,000 (28.49%)

FRACTEL, LLC 42,000 (22.58%)

U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 23,000 (12.37%)

SHELCOMM 20,000 (10.75%)

TON80 COMMUNICATIONS, LLC 11,000 (5.91%)

HD CARRIER LLC 10,000 (5.38%)

BARR TELL USA, LLC 8,000 (4.30%)

INTEGRATED PATH COMMUNICATIONS, LLC - CA 8,000 (4.30%)

IP HORIZON LLC 7,000 (3.76%)

AIRESPRING, INC. 2,000 (1.08%)

CURATEL, LLC - CA 1,000 (0.54%)

DMR COMMUNICATIONS INC. - CA 1,000 (0.54%)

Cities and Towns in Area Code 657

Anaheim, California Brea, California Buena Park, California Cypress, California Fullerton, California Garden Grove, California Huntington Beach, California Laguna Beach, California Orange, California Placentia, California San Juan Capistrano, California Santa Ana, California Silverado, California Westminster, California Yorba Linda, California

These geographic regions are also served by area code 714.

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 657, 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