Area code 415, Telephone prefix in San Francisco and Marin County, California.
Area code 415 covers the entire city of San Francisco and northern suburbs in Marin County, from downtown districts to towns such as Sausalito. It includes densely populated neighborhoods as well as residential areas beyond the Golden Gate Bridge.
The prefix was established in 1947 as one of the first North American telephone zones. Between 1959 and 1997 the territory was split several times to meet new number demand.
The prefix links neighborhoods such as Mission and Haight-Ashbury with coastal towns north of the Golden Gate Bridge. Residents often mention the number as a sign of their connection to the Bay Area.
Since the overlay with area code 628 in 2015, all local calls require dialing the full ten-digit number including the prefix. Calls within the region follow the same procedure as long-distance dialing.
San Francisco retained the original number since 1947, while surrounding areas received new prefixes due to population growth. The number is sometimes used as an informal marker for longtime city residents.
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