What is what area code is 669?

Area code 669 is a California area code that overlays area code 408.

• It serves the same geographic region as area code 408, which includes the heart of Silicon Valley.
• Major cities within the 669/408 area code include San Jose, Sunnyvale, Santa Clara, Milpitas, and parts of the surrounding Santa Clara County.
• Due to the overlay, 10-digit dialing (area code + 7-digit number) is required for all calls within the 669 and 408 area codes.
• It was introduced in 2012 to provide additional phone numbers to the region.