top of page


area code

Biggest city:

San Mateo




Pacific (GMT -8)

Nearby area codes: 

Zip codes



Major Cities:

San Francisco, Daly City, San Mateo, Redwood City, South San Francisco, San Bruno, Pacifica, Foster City, Menlo Park, Burlingame, San Carlos, East Palo Alto, Belmont, Millbrae, Half Moon Bay, Hillsborough, Atherton.

San Mateo

Average Income:





Unemployment Rate:

The 650 area code is an important part of California's telecommunications network, serving a portion of the San Francisco Bay Area and playing a crucial role in connecting its communities. Serving the San Francisco Peninsula: Introduced in 1997 as a split from the 415 area code, the 650 area code covers the San Francisco Peninsula in Northern California. This includes cities like Palo Alto, San Mateo, and Redwood City. The 650 area code is essential for linking various communities within this economically vibrant and technologically advanced region, situated between San Francisco and San Jose. Supporting a Hub of Technology and Innovation: The area served by the 650 area code is known for its significant role in the tech industry, with Silicon Valley home to many of the world's largest high-tech corporations and thousands of startup companies. The region is also important for education, housing prestigious institutions such as Stanford University. The 650 area code supports the high volume of communication required by these industries and the diverse population of the area. Adapting to Urban Growth and Technological Changes: The introduction of the 650 area code was a response to the increasing demand for phone numbers in the San Francisco Peninsula, driven by the rapid growth of the tech industry and the proliferation of mobile devices and internet services. This change reflects the area's adaptation to evolving communication needs and technological advancements, ensuring continued and efficient service for residents and businesses. The 650 area code represents the dynamic and innovative communities of the San Francisco Peninsula, supporting a range of economic activities and playing a crucial role in the region's communication and connectivity, particularly in the heart of Silicon Valley.
bottom of page