Area code in the Bay Area. located on the
peninsula pretty much
inbetween San Francisco (415) and San Jose (408). Sometimes called "West Bay" although there's really no such thing.
Some cities cities in 650 are:
SAN CARLOS, Burlingame, East Palo Alto, Los Altos, Menlo Park, Millbrae, Pacifica, Palo Alto, Redwood City, San Bruno, and San Mateo. Sorry if I forgot some
Belmont is also in 650, although it is one of the crappiest cities ever.