Area Code 707

Area Code 707 History:

01/01/1959
Area code 707 was officially put into service. Area code 707 was created from a split of area code 415.

02/01/2023
Area code 369 was put into service as an all services overlay of area code 707. Area code 369 serves the same geographic area as area code 707. Ten digit dialing (area code + seven digit number) is necessary in the 369/707 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 707 include:

Del Norte County, Humboldt County, Lake County, Marin County, Mendocino County, Napa County, Solano County, Sonoma County, and Trinity County.

Major cities or places in California within area code 707 include:

Area code 707 serves most of northwest California including the larger cities and communities of Benicia, Eureka, Fairfield, Napa, Petaluma, Rohnert Park, Santa Rosa, Suisun City, Vacaville, Vallejo, and Windsor, in addition to many smaller communities within the area code 707 service area.