Area Code 650 History:
Area code 650 was put into service. Area code 650 was created from a split of area code 415.
Counties in California within area code 650 include:
San Mateo County and Santa Clara County.
Major cities or places in California within area code 650 include:
Area code 650 serves most of San Mateo County and a small area in northwest Santa Clara County, including the larger cities and communities of Belmont, Burlingame, Daly City, East Palo Alto, Foster City, Los Altos, Menlo Park, Millbrae, Mountain View, Pacifica, Palo Alto, Redwood City, San Bruno, San Carlos, San Mateo, and South San Francisco area, in addition to many smaller communities within the area code 650 service area.