Area Code 341

California

Area code 341 serves California, primarily Oakland, in the Pacific Time (PT) time zone. It is an overlay area code sharing territory with area code 510.

Overlay Area Code

This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.

This area code shares its geographic region with: area code 510 (Oakland).

In service since: 22-Jul-2019

Learn more about overlay and split area codes →

Demographics & Economics

Total Population: 2,163,410
Population Density: 159 people/sq mi
above U.S. average (U.S.: 93 people/sq mi)
Median Household Income: $79,877
near U.S. median (U.S.: $75,144)
Poverty Rate: 13.5%
above U.S. average (U.S.: 11.5%)
Unemployment Rate: 7.9%
above U.S. average (U.S.: 3.6%)
Education Attainment: Bachelor's Degree+
21.5%
below U.S. average (U.S.: 33.7%)
High School or Lower
38.7%

Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.

See how this area code compares to all US area codes in the Statistics dashboard.

Time Zone

Pacific Time (PT)

NANPA Relief Status

According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.

Source: NANPA NPA Relief Planning Reports · See all relief planning statuses

Current Time

Pacific Time (PT)

Prefix Utilization

Geographic Coverage

State

Major Cities

Oakland
Fremont
Hayward
Berkeley
Richmond
San Leandro
Alameda
Castro Valley
Newark
San Pablo
San Lorenzo
Hercules
El Cerrito
Ashland
Albany
Pinole
Cherryland
Emeryville
Piedmont
Fairview
Rodeo
Kensington
Tara Hills
North Richmond

and 10 more cities

Area Code 341 geographic coverage map (light mode)

Historical Timeline of Area Code 341

Area code 341 was activated on July 22, 2019 as an all-services overlay of area code 510 in California's East Bay, covering Oakland, Fremont, and Hayward. NANPA originally assigned 341 as relief for 510 in 1999, but nationwide number pooling delayed its activation by two decades. CPUC Decision D.18-06-013 approved the overlay on June 21, 2018, with mandatory 10-digit dialing taking effect June 22, 2019. (Source: CPUC Decision D.18-06-013)

Key milestones:

1991: Area code 510 created September 2, 1991 in a split from the 415 numbering plan area, serving the East Bay region of California. (Source: CPUC Press Release)
1998: Area code 925 split off from 510 on March 14, 1998, serving the inland East Bay east of the Berkeley Hills. (Source: CPUC Press Release)
1999: NANPA originally assigned 341 as relief code for 510, but nationwide number pooling procedures eliminated the immediate need. NANPA retained 341 for future relief. (Source: Wikipedia)
2016: CPUC projected 510 NPA would exhaust numbering pool by Q2 2019, triggering the relief process. (Source: CPUC)
2017: NANPA filed Application A.17-05-013 on May 19, 2017 requesting overlay relief. CPUC held public mitigation meetings in Oakland and Berkeley on January 17, and in Hayward on February 15. (Source: CPUC Press Release)
2018: CPUC approved 341 overlay via Decision D.18-06-013 on June 21, 2018, adopting a 13-month implementation schedule. NANPA issued Planning Letter PL-518 on July 30, 2018. (Source: CPUC Decision)
2018: Permissive 1+10-digit dialing began December 15, 2018 at 12:01 AM PT. (Source: NANPA PL-518)
2019: Mandatory 1+10-digit dialing began June 22, 2019. New 341 area codes activated July 22, 2019. Test number 341-341-1341 was used to verify routing. (Source: NANPA PL-518)

Area code 341's creation spanned 20 years from its original assignment in 1999 to activation in 2019, making it one of the longest-delayed area code activations in North American numbering history. The overlay preserved existing 510 numbers while providing new numbering resources for the East Bay's growing population.

Regulatory History

Area code 341 was authorized through CPUC Application A.17-05-013 and Decision D.18-06-013, governing the all-services overlay of the 510 numbering plan area. The regulatory process included public mitigation meetings, a 13-month implementation schedule, and mandatory 10-digit dialing transition. (Source: CPUC Decision D.18-06-013)

Document	Date	Key Action
CPUC Press Release A.17-05-013	2018-06-21	Announces overlay approval; notes 510 created 1991 from 415, 925 split 1998. (Source: CPUC)
CPUC Decision D.18-06-013	2018-06-21	Approves all-services overlay; adopts 13-month implementation; no existing customer changes required. (Source: CPUC)
NANPA PL-518	2018-07-30	Permissive dialing Dec 15, 2018; mandatory Jun 22, 2019; activation Jul 22, 2019. (Source: NANPA)
Public Mitigation Meetings	2017-01-17 / 2017-02-15	Oakland and Berkeley sessions (Jan 17); Hayward session (Feb 15). (Source: CPUC)
NANPA Application	2017-05-19	Overlay relief request filed for 510 NPA. (Source: CPUC)