The area code 628 is located in San Francisco, California.
Area code 628 serves San Francisco, California, and neighboring Marin County as an overlay to the long‑standing 415 area code. This Bay Area code covers world‑famous landmarks such as the Golden Gate Bridge, Alcatraz Island, the Presidio, and Marin’s Muir Woods and Mount Tamalpais. Because 628 overlays 415, both area codes share the same map, and 10‑digit dialing is required for local calls. New 628 phone numbers work just like 415 numbers and connect to the same San Francisco area networks and services.
Major cities and communities covered by the 415/628 overlay include:
Introduced in 2015, area code 628 was added to meet growing demand for new phone numbers while keeping existing 415 numbers in place. The 415 code itself dates back to 1947, making it one of California’s original area codes, and 628 helps preserve that legacy while expanding capacity. If you get a 628 phone number, it still represents the same Bay Area region—home to tech, finance, arts, and some of the most visited sights in the country. Fun fact: the Golden Gate Bridge literally links the two counties served by 415/628, connecting San Francisco to Marin’s coastal towns and redwood parks.
Introduced as an overlay to 415 in 2015; 10‑digit dialing is required for local calls. — California Public Utilities Commission