Area code 650 is a telephone area code in California that serves the San Francisco Peninsula, including the cities of San Mateo, Redwood City, Palo Alto, Menlo Park, and Mountain View. It was created in 1997 when it split from the original area code 415, which covers San Francisco and Marin County.

The 650 area code is located on the coast of California. Two counties, San Mateo and Santa Clara fall within this area code. The major cities served by the area code include San Mateo, Daly City, Redwood City, Mountain View, Palo Alto, Menlo Park and San Bruno.

Area code 650 is a telephone area code in the North American Numbering Plan (NANP) for the San Francisco Bay Area in the U.S. state of California.

The 650 area code was created in August 1997 when it was split from the 415 area code. Today, the 650 area code serves San Mateo County and northern portions of Santa Clara County north from Mountain View. The area is located within the San Francisco and San Jose Metropolitan Statistical Areas (MSAs).