What is berkeley area codes?

Berkeley, California, uses two area codes: 510 and 925.

The 510 area code covers the western portion of Alameda County, including Berkeley, Oakland, and Fremont. It was established in 1991 as a split from the 415 area code.

The 925 area code covers Contra Costa County and the eastern part of Alameda County, including Danville, San Ramon, and Walnut Creek. It was established in 1998 as a split from the 510 area code.

Both area codes are in the Pacific Time Zone and are overlaid with the 341 area code. This means that new phone numbers in these areas may be assigned either the 510, 925, or 341 area code.