Area Code Overview

Area code 341 is a geographic telephone area code in California that went into service on July 22, 2019. The geographic regions covered by this area code overlay has a population of approximately 1,906,674.

Overlay and Dialing Rules

Area Code: 341
State: California
Type: General Purpose Code
In Service Date: July 22, 2019
Overlay Complex: 341/510
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 341

This area code is ranked 322nd out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 35th out of 39.

1,005,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 341

Total assigned 1,005,000

Wireless

385,000 assigned

38.31%

Wireline and VoIP

530,000 assigned

52.74%

Other / Unclassified

90,000 assigned

8.96%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 341

Estimated assigned wireless phone numbers: 385,000

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

T-Mobile 146,000 (37.92%)

AT&T Wireless 140,000 (36.36%)

Verizon Wireless 99,000 (25.71%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 341

Estimated assigned wireline and VoIP phone numbers: 530,000

Onvoy 291,000 (54.91%)

Bandwidth 84,000 (15.85%)

Spectrum 51,000 (9.62%)

Peerless Network 23,000 (4.34%)

SONIC TELECOM, LLC - CA 20,000 (3.77%)

Telnyx 20,000 (3.77%)

Commio 18,000 (3.40%)

Comcast Business 9,000 (1.70%)

MCIMETRO ACCESS TRANSMISSION SERVICES LLC 6,000 (1.13%)

TERRA NOVA TELECOM INC. 5,000 (0.94%)

Wide Voice 2,000 (0.38%)

NUSO 1,000 (0.19%)

Other / Unclassified Assigned Numbering in Area Code 341

Estimated assigned other or unclassified phone numbers: 90,000

FRACTEL, LLC 51,000 (56.67%)

SHELCOMM 10,000 (11.11%)

IP HORIZON LLC 8,000 (8.89%)

TELEPORT COMMUNICATIONS AMERICA, LLC - CA 8,000 (8.89%)

TON80 COMMUNICATIONS, LLC 4,000 (4.44%)

WHITESKY COMMUNICATIONS, LLC 4,000 (4.44%)

U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 2,000 (2.22%)

AIRESPRING, INC. 1,000 (1.11%)

EXIANT COMMUNICATIONS LLC 1,000 (1.11%)

HD CARRIER LLC 1,000 (1.11%)

Cities and Towns in Area Code 341

Crockett, California Fremont, California Hayward, California Hercules, California Oakland, California Pinole, California Richmond, California

These geographic regions are also served by area code 510.

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 341, 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