Area Code 925

California

Area code 925 serves California, primarily Concord, in the Pacific Time (PT) time zone. It was created from a split of area code 510.

Split Area Code

This area code was created by splitting an existing area code into separate geographic regions. When a split occurs, some customers in the original area code region are assigned the new area code.

This area code was split from area code 510 (Oakland).

In service since: 14-Mar-1998

Learn more about overlay and split area codes →

Demographics & Economics

Total Population: 1,307,421
Population Density: 1,672 people/sq mi
above U.S. average (U.S.: 93 people/sq mi)
Median Household Income: $125,727
above U.S. median (U.S.: $75,144)
Poverty Rate: 8.5%
below U.S. average (U.S.: 11.5%)
Unemployment Rate: 5.7%
above U.S. average (U.S.: 3.6%)
Education Attainment: Bachelor's Degree+
46.4%
above U.S. average (U.S.: 33.7%)
High School or Lower
23.0%

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

Concord
Antioch
Livermore
San Ramon
Mountain View
Pleasanton
Pittsburg
Dublin
Walnut Creek
Brentwood
Oakley
Danville
Martinez
Pleasant Hill
Lafayette
Bay Point
Orinda
Moraga
Discovery Bay
Alamo
Clayton
Blackhawk
Contra Costa Centre
Camino Tassajara

and 17 more cities

Area Code 925 geographic coverage map (light mode)

Demographics

The estimated population served by area code 925 is approximately 1,307,421. The population density is 1,672 people per square mile, which is higher than the national average of 93. The median household income is $125,727, which is higher than the national median of $75,144. Approximately 46.4% of adults hold a bachelor's degree or higher, compared to the national rate of 33.7%. This rate is higher than the national average. The poverty rate stands at 8.5%, which is lower than the national rate of 11.5%.

History

Area code 925 was created from a split of area code 510. It was introduced in 1998 as part of a geographic division to provide additional numbering resources.