Area code 650 is a
telephone
A telephone, colloquially referred to as a phone, is a telecommunications device that enables 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 ...
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, rea ...
in the
North American Numbering Plan
The North American Numbering Plan (NANP) is an integrated 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, World Numbering Zone ...
(NANP) for the
San Francisco Bay Area
The San Francisco Bay Area, commonly known as the Bay Area, is a List of regions of California, region of California surrounding and including San Francisco Bay, and anchored by the cities of Oakland, San Francisco, and San Jose, California, S ...
in the
U.S. state of
California
California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
. 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, officially the City and County of San Francisco, is a commercial, Financial District, San Francisco, financial, and Culture of San Francisco, cultural center of Northern California. With a population of 827,526 residents as of ...
, and the northwestern portion of
Santa Clara County including
Palo Alto
Palo Alto ( ; Spanish language, Spanish for ) is a charter city in northwestern Santa Clara County, California, United States, in the San Francisco Bay Area, named after a Sequoia sempervirens, coastal redwood tree known as El Palo Alto.
Th ...
,
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 (small portion in
415)
*
East Palo Alto
*
El Granada
*
Emerald Lake Hills
*
Foster City
*
Half Moon Bay
Half Moon Bay is a coastal city in San Mateo County, California, San Mateo County, California, United States, approximately south of San Francisco. Its population was 11,795 2020 United States census, 2020 census. Immediately north of Half Mo ...
*
Highlands-Baywood Park
*
Hillsborough
*
Kings Mountain
*
La Honda
*
Ladera
*
Loma Mar
*
Los Trancos Woods
*
Menlo Park
*
Middleton Tract
*
Millbrae
*
Montara
*
Moss Beach
*
North Fair Oaks
*
Pacifica
*
Pescadero
*
Portola Valley
*
Princeton-by-the-Sea
*
Redwood City
*
San Bruno
*
San Carlos
*
San Gregorio
*
San Mateo
*
Sky Londa
*
South San Francisco
*
West Menlo Park
*
Woodside
Santa Clara County
*
Los Altos
*
Los Altos Hills
*
Loyola
*
Mountain View
*
Palo Alto
Palo Alto ( ; Spanish language, Spanish for ) is a charter city in northwestern Santa Clara County, California, United States, in the San Francisco Bay Area, named after a Sequoia sempervirens, coastal redwood tree known as El Palo Alto.
Th ...
*
Stanford
*
Sunnyvale (western edge)
San Francisco County
*
San Francisco
San Francisco, officially the City and County of San Francisco, is a commercial, Financial District, San Francisco, financial, and Culture of San Francisco, cultural center of Northern California. With a population of 827,526 residents as of ...
References
External links
List of exchanges from AreaCodeDownload.com, 650 Area Code
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650
650
Northern California
1997 introductions