Area Code Overview

Area code 408 is a geographic telephone area code in California that went into service on January 1, 1959. The geographic regions covered by this area code overlay has a population of approximately 2,121,167.

Overlay and Dialing Rules

Area Code: 408
State: California
Type: General Purpose Code
In Service Date: January 1, 1959
Overlay Complex: 408/669
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 408

This area code is ranked 69th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 13th out of 39.

6,373,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 408

Total assigned 6,373,000

Wireless

2,211,000 assigned

34.69%

Wireline and VoIP

3,651,000 assigned

57.29%

Other / Unclassified

511,000 assigned

8.02%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 408

Estimated assigned wireless phone numbers: 2,211,000

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

AT&T Wireless 783,000 (35.41%)

T-Mobile 721,000 (32.61%)

Verizon Wireless 667,000 (30.17%)

33 WIRELESS INC. 40,000 (1.81%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 408

Estimated assigned wireline and VoIP phone numbers: 3,651,000

AT&T 2,052,000 (56.20%)

Bandwidth 411,000 (11.26%)

Lumen 293,000 (8.03%)

Onvoy 250,000 (6.85%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC 203,000 (5.56%)

Verizon 123,000 (3.37%)

Comcast Business 94,000 (2.57%)

Spectrum 62,000 (1.70%)

UTILITY TELECOM GROUP, LLC - CA 58,000 (1.59%)

Peerless Network 38,000 (1.04%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 28,000 (0.77%)

PAETEC ITEL, LLC 17,000 (0.47%)

Other / Unclassified Assigned Numbering in Area Code 408

Estimated assigned other or unclassified phone numbers: 511,000

SPOK, INC. 270,000 (52.84%)

TELEPORT COMMUNICATIONS AMERICA, LLC - CA 100,000 (19.57%)

U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 95,000 (18.59%)

NORTH COUNTY COMMUNICATION CORPORATION - CA 20,000 (3.91%)

IP HORIZON LLC 19,000 (3.72%)

HD CARRIER LLC 4,000 (0.78%)

INTEGRATED PATH COMMUNICATIONS, LLC - CA 1,000 (0.20%)

WHITESKY COMMUNICATIONS, LLC 1,000 (0.20%)

XO CALIFORNIA, INC. 1,000 (0.20%)

Cities and Towns in Area Code 408

Campbell, California Gilroy, California Hollister, California Los Gatos, California Morgan Hill, California Salinas, California San Antonio, California San Jose, California San Martin, California Saratoga, California Sunnyvale, California

These geographic regions are also served by area code 669.

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 408, 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