top of page


area code

Biggest city:

San Francisco




Pacific (GMT -8)

Nearby area codes: 

Zip codes



Major Cities:

San Francisco, Daly City, Brisbane, San Rafael, Novato, Mill Valley, San Anselmo, Corte Madera, Tiburon, Fairfax, Sausalito, Kentfield, Santa Venetia, Marin City, Ross, Belvedere

San Francisco

Average Income:





Unemployment Rate:

The 628 area code is a significant part of the telecommunication landscape in California, USA. Geographical Coverage and Introduction Date: Area code 628 serves the state of California and was assigned on December 19, 2013. It officially went into service on March 21, 2015. This area code was introduced to provide relief to the existing 415 area code, with which it overlaps​​. Major Cities and Counties Served: The largest city served by area code 628 is San Francisco. Additionally, it covers a total of 13 cities, including notable ones like Oakland, San Rafael, Novato, and Mill Valley. In terms of county coverage, it spans San Francisco County, Marin County, and Alameda County​​. Time Zone Information: Area code 628 operates in the Pacific Standard Time (PST) zone. This is significant for understanding the timing of communications, especially for businesses and individuals dealing with contacts across different time zones​​. In conclusion, the 628 area code is an integral part of California's telecommunication network, playing a crucial role in connecting various cities and counties, most notably San Francisco. Its introduction has helped in managing the region's growing demand for phone numbers and ensuring efficient communication across the state.
bottom of page