Where Is Area Code 628?
Area code 628 serves San Francisco and nearby parts of the North Bay and northern Peninsula in California. It covers the same geographic territory as area code 415 because 628 is an overlay, not a separate region.
San Francisco is the primary city. The service area includes all of San Francisco County, most of Marin County, and a small portion of San Mateo County. Communities include San Rafael, Novato, Mill Valley, Sausalito, San Anselmo, Tiburon, Brisbane, and Daly City.
The area includes major landmarks such as the Golden Gate Bridge, the Presidio of San Francisco, Alcatraz Island, and Muir Woods National Monument. The Golden Gate connects San Francisco with Marin County across the northern part of the service area.
Cities and Communities in the 628 Area Code
- Belvedere, Marin County
- Brisbane, San Mateo County
- Corte Madera, Marin County
- Daly City, San Mateo County
- Fairfax, Marin County
- Larkspur, Marin County
- Mill Valley, Marin County
- Novato, Marin County
- Ross, Marin County
- San Anselmo, Marin County
- San Francisco, San Francisco County
- San Rafael, Marin County
- Sausalito, Marin County
- Tiburon, Marin County
History of Area Code 628
Area code 628 entered service on March 21, 2015, as an overlay of area code 415. The overlay added new telephone numbers to the existing region without dividing San Francisco, Marin County, or the other communities into a new geographic area.
Area code 415 was one of the 86 original North American Numbering Plan area codes assigned in 1947. Telephone number growth later led to geographic splits that created area code 510 in 1991 and area code 650 in 1997. The 628 overlay increased number capacity while preserving the long-standing 415 service area.
Key Facts About Area Code 628
- Area code 628 is a geographic area code in California, with San Francisco as its primary city.
- Area code 628 is part of the Pacific region under U.S. Census regional divisions.
- Area code 628 covers San Francisco County, most of Marin County, and a small part of San Mateo County.
- Area code 628 is an overlay of area code 415, so both codes operate in the same geographic service area.
- Area code 628 entered service on March 21, 2015.
- The geographic region includes the Golden Gate Bridge, Alcatraz Island, the Presidio of San Francisco, and Muir Woods National Monument.
- The region includes the University of California, San Francisco, the University of San Francisco, and San Francisco State University.
- Area code 628 uses Pacific Time.
Frequently Asked Questions
What state is area code 628 in?
Area code 628 is in California.
What major cities use area code 628?
San Francisco is the primary city, and other major communities include San Rafael, Novato, Mill Valley, Sausalito, San Anselmo, Tiburon, Brisbane, and Daly City.
What time zone is area code 628 in?
Area code 628 uses Pacific Time.
Is area code 628 a toll-free number?
No, area code 628 is a geographic area code, not a toll-free number.