Editing Area codes 415 and 628

{{short description|Area codes for San Francisco and Marin County, California}}
{{California area codes image map|415 and 628}}
'''Area codes 415 and 628''' are [[telephone]] [[area code]]s in the [[North American Numbering Plan]] (NANP) for the city of [[San Francisco]] and its northern suburbs in [[Marin County, California|Marin County]] (across the [[Golden Gate]]), and the northeast corner of [[San Mateo County, California|San Mateo County]] in the U.S. state of [[California]]. Area code 415 was one of the eighty-six [[original North American area codes]] established in 1947, but modified in geographic configuration later. Area code 628 was assigned in 2015 to form an [[overlay plan|overlay]] in that numbering plan area in mitigation of central office prefix exhaustion.

==History==
When the [[American Telephone and Telegraph Company]] (AT&T) introduced the first nationwide [[telephone numbering plan]] for [[Operator Toll Dialing]] in 1947, the state of [[California]] was divided into three numbering plan areas (NPAs) arranged as geographical zones in the southern part, the central part, and the northern part of the state.<ref>{{cite journal |last=Mabbs |first=Ralph I. |title=Nation-wide Operator Toll Dialing—the Coming Way |journal=Bell Telephone Magazine |date=Winter 1947–1948 |volume=26 |issue=4 |page=181 |url=https://archive.org/details/sim_bell-telephone-magazine_winter-1947-1948_26_4/page/n5/ |access-date=2022-12-26}}</ref> Area code 415 was assigned to central California, south of [[area code 916]], and north of [[area code 213]]. It stretched from [[Sacramento]] in the north to [[Bakersfield, California|Bakersfield]] in the south.<ref>{{cite web |last=Madison|first=Linc|url=http://www.lincmad.com/map1947.html |title=LincMad's 1947 Area Code Map|date=1999-05-27 |access-date=2007-01-06| archive-url= https://web.archive.org/web/20070104181058/http://www.lincmad.com/map1947.html| archive-date= 4 January 2007 | url-status= live}}</ref>

In 1950, the boundaries of the numbering plan area were redrawn to produce a division of the northern and central parts along a north–south-running dividing line. Numbering plan area 415 became the coastal region from the [[North Coast (California)|North Coast]] to the [[Oregon]] border, while 916 was redrawn to comprise the northeastern corner of the state.<ref>{{cite journal|last=Moore|first=Carl|journal=TELECOM Digest|url=http://massis.lcs.mit.edu/archives/areacodes/history.area.splits.2-96 |title=history.of.area.splits|date=1996-02-12 |access-date=2007-01-06|archive-url=https://archive.today/20120710002143/http://massis.lcs.mit.edu/archives/areacodes/history.area.splits.2-96|archive-date=10 July 2012}}</ref>  As part of this realignment, Sacramento was renumbered from area code 415 to 916, and Bakersfield to 213.

With the preparations for nation-wide [[direct distance dialing]] (DDD) in the early 1950s, [[area code 318]] was temporarily used in the San Francisco area, initially by customers in [[Englewood, New Jersey]], participating in the first customer trials to reach the city, as well as some areas north of the [[Golden Gate]].<ref>{{cite journal|last=Cuccia |first=Mark|journal=TELECOM Digest|url=http://www.textfiles.com/digest/TELECOMDIGEST/vol16.iss0401-0450.txt |title=Re: When Was Direct Distance Dialing Cut In?|date=1996-08-13 |access-date=2007-01-06}}</ref> In 1953, the entire Bay Area was "reunited" in using area code 415.

Numbering plan area 415 has been split several times due to population growth and infrastructure changes.

On March 1, 1959, [[area code 707]] was created from the northern part, and [[area code 408]] was created for [[San Jose, California|San Jose]], the [[Santa Clara Valley|South Bay]], the [[Monterey Bay]], and the [[Salinas Valley]].<ref>{{cite web|last=Madison |first=Linc |url=http://www.areacode-info.com/!history/1940s50s.htm |archive-url=https://web.archive.org/web/20020911092304/http://areacode-info.com/!history/1940s50s.htm |url-status=dead |archive-date=2002-09-11 |title=NANP Area Code History: 1948 - 1959 |access-date=2007-01-06 }}</ref>  (408 has since been split to [[Area code 831|831]] and overlaid with 669. 707 has since been overlaid with [[Area code 369|369]].)

On September 2, 1991, [[area code 510]] was created for the [[East Bay]], including [[Oakland, California|Oakland]].<ref>{{cite journal|last=Fabisch|first=M.P.|journal=Bellcore Letter|url=http://www.nanpa.com/pdf/old_pl/IL%2090-06-023.pdf|title=NANPA Revised Date for Split of 415 (California) Numbering Plan Area|date=1990-06-13|access-date=2007-01-06|archive-url=https://web.archive.org/web/20110604120756/http://www.nanpa.com/pdf/old_pl/IL%2090-06-023.pdf|archive-date=2011-06-04|url-status=dead}}</ref>  (510 has since been split to [[Area code 925|925]] and was overlaid by 341 in 2019.)

On August 2, 1997, [[area code 650]] was created; the partition approximately followed the boundary between San Francisco, which (along with Marin County) kept 415, and [[San Mateo County, California|San Mateo County]] to the south, which received the new code.  Deviations from the county line included a very small area east of the [[San Francisco Golf Club]], which was changed to 650,<ref>{{cite web|url=http://www.att.com/gen/press-room?pid=4800&cdvn=news&newsarticleid=4002 |title=AT&T- News Room |publisher=Att.com |date=1998-01-28 |access-date=2012-09-07}}</ref> and portions of [[Brisbane, California|Brisbane]] and [[Daly City, California|Daly City]], which remained in 415.<ref>{{cite journal|last=Deak|first=J.N.|journal=North American Numbering Plan Letter|volume=PL-NANP-022|url=http://www.nanpa.com/pdf_previous/08_02_99/pl_nanp_022.pdf|title=NANPA Revised Date for Split of 415 (California) Numbering Plan Area|date=1996-11-22|access-date=2007-01-06|archive-date=2008-12-30|archive-url=https://web.archive.org/web/20081230155337/http://www.nanpa.com/pdf_previous/08_02_99/pl_nanp_022.pdf|url-status=dead}}</ref>

On February 21, 2015, the numbering plan area was converted to an [[overlay complex]] by adding '''area code 628''' to the same service area,<ref>{{Cite web |url=http://www.cpuc.ca.gov/PUC/Telco/generalInfo/Area+Codes/415+Area+Code.htm |title=415 Area Code|website=California Public Utilities Commission |access-date=2015-02-25 |archive-url=https://web.archive.org/web/20150226025654/http://www.cpuc.ca.gov/PUC/Telco/generalInfo/Area+Codes/415+Area+Code.htm |archive-date=2015-02-26 |url-status=dead }}</ref> making [[ten-digit dialing]] mandatory in the area, with prefix ''1'' from landlines.<ref>{{Cite web|url=https://www.sfgate.com/bayarea/article/Starting-Saturday-415-shares-the-city-with-6090563.php|title=415, meet 628: New S.F. area code debuts Saturday|last=Rubenstein|first=Steve|date=2015-02-20|website=SFGate|access-date=2020-04-26}}</ref>

==Service area==
===City and County of San Francisco===
*[[San Francisco]]

===Marin County===
{{div col|colwidth=9em}}
*[[Bel Marin Keys, California|Bel Marin Keys]]
*[[Belvedere, California|Belvedere]]
*[[Black Point-Green Point, California|Black Point-Green Point]]
*[[Bolinas, California|Bolinas]]
*[[California Park, California|California Park]]
*[[Corte Madera, California|Corte Madera]]
*[[Dogtown, Marin County, California|Dogtown]]
*[[Fairfax, California|Fairfax]]
*[[Greenbrae, California|Greenbrae]]
*[[Ignacio, California|Ignacio]]
*[[Inverness Park, California|Inverness Park]]
*[[Inverness, California|Inverness]]
*[[Kentfield, California|Kentfield]]
*[[Lagunitas-Forest Knolls, California|Lagunitas-Forest Knolls]]
*[[Larkspur, California|Larkspur]]
*[[Lucas Valley-Marinwood, California|Lucas Valley-Marinwood]]
*[[Manor, California|Manor]]
*[[Marconi, California|Marconi]]
*[[Marin City, California|Marin City]]
*[[Marshall, California|Marshall]]
*[[McNears Beach, California|McNears Beach]]
*[[Mill Valley, California|Mill Valley]]
*[[Muir Beach, California|Muir Beach]]
*[[Nicasio, California|Nicasio]]
*[[Novato, California|Novato]]
*[[Olema, California|Olema]]
*[[Paradise Cay, California|Paradise Cay]]
*[[Point Reyes Station, California|Point Reyes Station]]
*[[Ross, California|Ross]]
*[[San Anselmo, California|San Anselmo]]
*[[San Geronimo, California|San Geronimo]]
*[[San Quentin, California|San Quentin]]
*[[San Rafael, California|San Rafael]]
*[[Santa Venetia, California|Santa Venetia]]
*[[Sausalito, California|Sausalito]]
*[[Sleepy Hollow, Marin County, California|Sleepy Hollow]]
*[[Stinson Beach, California|Stinson Beach]]
*[[Strawberry, Marin County, California|Strawberry]]
*[[Tamalpais-Homestead Valley, California|Tamalpais-Homestead Valley]]
*[[Tiburon, California|Tiburon]]
*[[Woodacre, California|Woodacre]] 
{{div col end}}

===San Mateo County===
*[[Brisbane, California|Brisbane]]
*[[Daly City, California|Daly City]]

==See also==
*[[List of California area codes]]
*[[List of North American Numbering Plan area codes]]

==References==
{{Reflist}}

==External links==
{{Area code footer|Map=CA}}

{{Area code box|State=CA
| This=415/628
| N=[[area codes 707 and 369|707/369]]
| S=[[area code 650|650]]
| E=[[area codes 510 and 341|510/341]], [[area code 925|925]]
| W=Pacific Ocean, [[area code 808|808]]
|S1=HI}}

{{coord|38|-122.6|region:US-CA_type:adm2nd|display=title}}

[[Category:Area codes in the United States|415]]
[[Category:Culture of San Francisco]]
[[Category:Area codes in California|415]]
[[Category:Marin County, California]]
[[Category:Northern California]]
[[Category:Telecommunications-related introductions in 1947]]
[[Category:Telecommunications-related introductions in 2015]]