Published: August 07, 2018
Towns and cities in the San Francisco Bay Area currently using area code 510 will be served by a new code: 341 is the new NPA announced by the California Public Utilities Commission in June. The two area codes will overlay or cover the same area. Some of the cities served by the new overlay complex: Alameda, Berkeley, El Cerrito, Oakland... 1+10 digit dialing becomes the new calling method starting June 22, 2019.
See official announcement and map of the new overlay complex 510/341 (PDF document).
Visit area code 341 page for a list of cities served, map and other info.