Area code 650 is a

telephone A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into e ...

area code in the

North American Numbering Plan The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the international calling ...

(NANP) for the

San Francisco Bay Area The San Francisco Bay Area, often referred to as simply the Bay Area, is a populous region surrounding the San Francisco, San Pablo, and Suisun Bay estuaries in Northern California. The Bay Area is defined by the Association of Bay Area G ...

in the U.S. state of

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...

. It was split from area code 415 on August 2, 1997, and includes most of San Mateo County (except the northernmost portion), part of

San Francisco San Francisco (; Spanish for " Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the fourth most populous in California and 17t ...

, and the northwestern portion of

Santa Clara County Santa Clara County, officially the County of Santa Clara, is the sixth-most populous county in the U.S. state of California, with a population of 1,936,259, as of the 2020 census. Santa Clara County and neighboring San Benito County together ...

including Palo Alto, Mountain View, and Los Altos. Prior to October 2021, area code 650 had telephone numbers assigned for the central office code 988. In 2020, ''988'' was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a conflict for exchanges that permit seven-digit dialing. This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021.

Service area

San Mateo County

* Atherton * Belmont * Broadmoor * Burlingame * Colma *

Daly City Daly City () is the second most populous city in San Mateo County, California, United States, with population of 104,901 according to the 2020 census. Located in the San Francisco Bay Area, and immediately south of San Francisco (sharing its ...

(small portion in 415) * East Palo Alto * El Granada * Emerald Lake Hills *

Foster City Foster City is a city located in San Mateo County, California. The 2020 census put the population at 33,805, an increase of more than 10% over the 2010 census figure of 30,567. Foster City is sometimes considered to be part of Silicon Valle ...

* Half Moon Bay * Highlands-Baywood Park * Hillsborough * Kings Mountain *

La Honda La Honda (Spanish for "The Sling") is a census-designated place (CDP) in southern San Mateo County, California, United States. The population was 979 at the 2020 census. It is located in the Santa Cruz Mountains between the Santa Clara Valley and ...

* Ladera * Loma Mar * Los Trancos Woods * Menlo Park * Middleton Tract *

Millbrae Millbrae is a city located in northern San Mateo County, California, United States. To its northeast is San Francisco International Airport, San Bruno is on its northwest, and Burlingame on its southeast. It is bordered by San Andreas Lake ...

* Montara *

Moss Beach Moss Beach is a coastal census-designated place in San Mateo County, California, with a year 2020 census population of 3,214. Located in Moss Beach are the Fitzgerald Marine Reserve, a marine sanctuary; the Half Moon Bay Airport, the historic ...

* North Fair Oaks * Pacifica * Pescadero *

Portola Valley Portola Valley is a town in San Mateo County, California. Located on the San Francisco Peninsula in the Bay Area, Portola Valley is a small, wealthy community nestled on the eastern slopes of the Santa Cruz Mountains. History Portola Va ...

Princeton-by-the-Sea Princeton-by-the-Sea (sometimes, especially locally, called Princeton) is an unincorporated community on the coast of San Mateo County, California. The ZIP code is 94019 and the community is in area code 650. Profile This area was inhabite ...

* Redwood City *

San Bruno San Bruno (Spanish for " St. Bruno") is a city in San Mateo County, California, United States, incorporated in 1914. The population was 43,908 at the 2020 United States Census. The city is between South San Francisco and Millbrae, adjacent to ...

* San Carlos * San Gregorio * San Mateo * Sky Londa *

South San Francisco South San Francisco is a city in San Mateo County, California, United States, located on the San Francisco Peninsula in the San Francisco Bay Area. The city is colloquially known as "South City". The population was 66,105 at the 2020 cens ...

* West Menlo Park *

Woodside Woodside may refer to: Places and buildings Australia * Woodside, South Australia, a town * Woodside, Victoria, a town Canada * Woodside National Historic Site, the boyhood home of William Lyon Mackenzie King *Woodside, Nova Scotia, a neighbo ...

Santa Clara County

* Los Altos * Los Altos Hills * Loyola * Mountain View * Palo Alto * Stanford *

Sunnyvale Sunnyvale () is a city located in the Santa Clara Valley in northwest Santa Clara County in the U.S. state of California. Sunnyvale lies along the historic El Camino Real and Highway 101 and is bordered by portions of San Jose to the nort ...

(western edge)

San Francisco County

References

External links

List of exchanges from AreaCodeDownload.com, 650 Area Code
{{coord, 37.5, -122.3, region:US-CA_type:adm2nd, display=title

650 __NOTOC__ Year 650 (DCL) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 650 for this year has been used since the early medieval period, when the Anno Domini calendar era beca ...

Northern California 1997 introductions