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 el ...

area code A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, re ...

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 Gov ...

in the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its sove ...

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 ...

. It was split from area code 415 on August 2, 1997, and includes most of

San Mateo County San Mateo County ( ), officially the County of San Mateo, is a county located in the U.S. state of California. As of the 2020 census, the population was 764,442. Redwood City is the county seat, and the third most populated city following Dal ...

(except the northernmost portion), part of

San Francisco San Francisco (; Spanish language, Spanish for "Francis of Assisi, 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 List of Ca ...

, 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 f ...

including

Palo Alto Palo Alto (; Spanish for "tall stick") is a charter city in the northwestern corner of Santa Clara County, California, United States, in the San Francisco Bay Area, named after a coastal redwood tree known as El Palo Alto. The city was es ...

, 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 Seven-digit dialing is a telephone dialing procedure customary in some territories of the North American Numbering Plan (NANP) for dialing telephone numbers in the same numbering plan area (NPA). NANP telephone numbers consist of ten digits, of ...

. This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021.

Service area

San Mateo County

* Atherton *

Belmont Belmont may refer to: People * Belmont (surname) Places * Belmont Abbey (disambiguation) * Belmont Historic District (disambiguation) * Belmont Hotel (disambiguation) * Belmont Park (disambiguation) * Belmont Plantation (disambiguation) * Belmon ...

* Broadmoor * Burlingame * Colma * Daly City (small portion in

415 __NOTOC__ Year 415 ( CDXV) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Honorius and Theodosius (or, less frequently, year 1168 '' ...

) *

East Palo Alto East Palo Alto (abbreviated E.P.A.) is a city in San Mateo County, California, United States. As of the 2020 census, the population of East Palo Alto was 30,034. It is situated on the San Francisco Peninsula, roughly halfway between the cities of ...

El Granada El Granada is a village and census-designated place (CDP) in the coastal area of northern San Mateo County, California, United States. The population was 5,481 at the 2020 census. The village is named for the city of Granada, Spain. Geography El G ...

* Emerald Lake Hills * Foster City * Half Moon Bay * Highlands-Baywood Park *

Hillsborough Hillsborough may refer to: Australia *Hillsborough, New South Wales, a suburb of Lake Macquarie Canada *Hillsborough, New Brunswick *Hillsborough Parish, New Brunswick * Hillsborough, Nova Scotia, in Inverness County *Hillsborough (electoral d ...

* Kings Mountain * La Honda * Ladera *

Loma Mar Loma Mar (Spanish language, Spanish for "Sea Hill") is a census-designated place (CDP) in San Mateo County, California, San Mateo County, California. It is near San Mateo County Memorial Park on Pescadero Creek Road and is in area code 650. Loma M ...

Los Trancos Woods 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 Valle ...

* Menlo Park * Middleton Tract * Millbrae * Montara * Moss Beach *

North Fair Oaks North Fair Oaks is a census-designated place and an unincorporated area located in San Mateo County, California adjacent to Redwood City, Atherton, and Menlo Park. As of the 2020 census the area had a total population of 14,027. Because of the l ...

* 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 Redwood City is a city on the San Francisco Peninsula in Northern California's 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 e ...

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 Sky Londa is an unincorporated mountain community in San Mateo County, California located at the intersection of State Route 84 (La Honda Road) and State Route 35 (Skyline Boulevard). The community is inside area code 650 and ZIP code 94062 ...

* South San Francisco * 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 neighborho ...

Santa Clara County

* Los Altos * Los Altos Hills * Loyola * Mountain View *

Stanford Stanford University, officially Leland Stanford Junior University, is a private research university in Stanford, California. The campus occupies , among the largest in the United States, and enrolls over 17,000 students. Stanford is consider ...

* Sunnyvale (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 bec ...

Northern California 1997 introductions