Area code 650, Telephone prefix in San Francisco Peninsula, United States.
Area code 650 is a telephone prefix serving the western San Francisco Peninsula and includes cities such as Palo Alto, Mountain View, Redwood City, and several other communities in San Mateo County. It covers a zone that stretches from the southern suburbs of San Francisco down to the southern edge of San Mateo County, taking in both densely settled and less urban areas.
The California regulatory authority created area code 650 in 1997 when growing demand for telephone numbers required a split of the former 415 code. The division separated the Peninsula region from San Francisco and Marin County, creating a new numbering system for the rapidly growing communities south of the city.
Stanford University and numerous technology companies within the area code boundaries shape the educational and professional characteristics of San Francisco Peninsula.
All calls within this prefix zone require full ten-digit dialing, even when calling within the same city. Multiple phone carriers serve the region, so the choice of service provider does not affect the number to dial.
The prefix zone contains Silicon Valley regions, where global technology corporations maintain headquarters and research facilities alongside residential neighborhoods.
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