Area codes 408 and 669, Telephone prefix in Santa Clara County, United States.
Area codes 408 and 669 are telephone prefixes serving Santa Clara County in California, covering much of the southern portion of the San Francisco Bay. The territory includes urban centers like San Jose, the city of Cupertino, the town of Milpitas, and several smaller municipalities throughout the valley.
The 408 prefix was created in 1959 through a division of a larger telephone territory in northern California. In 2012, the second code 669 was introduced to meet growing demand for new phone numbers across the region.
The area codes encompass Silicon Valley, where numerous technology companies and telecommunications infrastructure shape the regional development.
When dialing within the entire territory, the prefix must always be entered along with the local number, making ten digits in total. This rule applies both when calling between neighboring streets and when connecting within the same city.
The shared use of both codes within the same geographic space means neighbors sometimes carry different prefixes. This arrangement arose from technical needs of modern telecommunications rather than from regional boundaries.
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