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Map of California numbering plan areas (blue) and border states. Area codes 415 and 628 are shown in red.

Area codes 415 and 628 are California telephone area codes for San Francisco and its northern suburbs in Marin County (across the Golden Gate Bridge), and the northeast corner of San Mateo County.[1]



415 was one of the original three area codes in California, established in 1947. It originally covered central California, south of area code 916 and north of area code 213. It stretched from Sacramento in the north to Bakersfield in the south.[2]

In 1950, 415 was extended along the North Coast to the Oregon border and shortened in the south, while 916 was rotated to cover the northeastern corner of the state.[3] As part of this realignment, Sacramento was shifted from 415 to 916, while Bakersfield moved to 213.

For a short time in the early 1950s, area code 318 was temporarily used, initially by customers in Englewood, New Jersey, participating in the first customer direct distance dialing experiment to reach San Francisco as well as some areas north of the Golden Gate.[4] In 1953, the entire Bay Area was "reunited" in using area code 415.

Area 415 has been split three times due to the Bay Area's rapid growth:

On February 21, 2015, area code 628 was assigned as an overlay for new numbers in the 415 territory, making ten-digit dialing mandatory in the area.[9] 415 had been one of the few urban area codes that had not been overlaid, making San Francisco one of the largest cities where seven-digit dialing still functioned.

Communities in the 415/628 area codesEdit

See alsoEdit


  1. ^
  2. ^ Madison, Linc (1999-05-27). "LincMad's 1947 Area Code Map". Archived from the original on 4 January 2007. Retrieved 2007-01-06. 
  3. ^ Moore, Carl (1996-02-12). "history.of.area.splits". TELECOM digest. Retrieved 2007-01-06. 
  4. ^ Cuccia, Mark (1996-08-13). "Re: When Was Direct Distance Dialing Cut In?". TELECOM digest. Retrieved 2007-01-06. 
  5. ^ Madison, Linc. "NANP Area Code History: 1948 - 1959". Retrieved 2007-01-06. [permanent dead link]
  6. ^ Fabisch, M.P. (1990-06-13). "NANPA Revised Date for Split of 415 (California) Numbering Plan Area" (PDF). Bellcore Letter. Retrieved 2007-01-06. 
  7. ^ "AT&T- News Room". 1998-01-28. Retrieved 2012-09-07. 
  8. ^ Deak, J.N. (1996-11-22). "NANPA Revised Date for Split of 415 (California) Numbering Plan Area" (PDF). North American Numbering Plan Letter. PL-NANP-022. Retrieved 2007-01-06. 
  9. ^ "415, meet 628: New S.F. area code debuts Saturday"

External linksEdit