Alameda County Area Codes

About Alameda County Area Codes

The county of Alameda County, located in California, is served by 2 telephone area code(s) in this dataset. These calling codes cover cities, suburbs, and unincorporated communities across the county.

Major phone area codes used in Alameda County include 510, 925. The county mainly follows the America/Los_Angeles time zone.

Cities and towns served by these area codes in Alameda County include Alameda, Berkeley, Castro Valley, Dublin, Fremont, Hayward, Livermore, Newark, Oakland, Pleasanton, San Leandro, San Lorenzo, Union City.

List of Area Codes in Alameda County, California

The table below lists all telephone area codes used in Alameda County, California, along with their associated cities and time zones from this dataset.

Related Area Code Pages

Explore related area code resources on Burning Compass:

• All area codes in California
• Individual area code details are available from the table above.