Area Code 820
Area Code 820 is in California
(310 and 424) - (341 and 510)
(415 and 628) - (408 and 669
(714 and 657) - (760 and 442)
(818 and 747) - (820 and 805)
(916 and 279)
Area Code 820 History:
Area code 820 was officially put into service as an all services overlay of area code 805. Effective 06/02/2018 ten digit dialing (area code + seven digit number) became necessary in the 805/820 overlay because different homes in the same geographic area can have the same seven digit phone number but each would have a different area code.
Counties in California within area code 820 include:
Monterey County, San Luis Obispo County, Santa Barbara County, and Ventura County.
Major cities or places in California within area code 820 include:
Area code 820 serves the larger cities and communities of Atascadero, Camarillo, Goleta, Lompoc, Moorpark, Orcutt, Oxnard, Port Hueneme, San Luis Obispo, Santa Barbara, Santa Maria, Santa Paula, Simi Valley, Thousand Oaks, and Vanderberg AFB, in addition to many smaller communities within the area code 820 service area.