When the North American Numbering Plan was installed by AT&T 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.[1] 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 in the south.[2]
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 to the Oregon border, while 916 was redrawn to comprise the northeastern corner of the state.[3] 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.[4] In 1953, the entire Bay Area was "reunited" in using area code 415.
Area code 415 has been split three times due to the Bay Area's rapid economic growth and demand for telecommunication services:
On September 2, 1991, area code 510 was created for the East Bay, including Oakland.[6] (510 has since been split to 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 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,[7] and portions of Brisbane and Daly City, which remained in 415.[8]
On February 21, 2015, the numbering plan area was transitioned to an overlay plan by adding area code 628 to the same service area for new numbers,[9] making ten-digit dialing mandatory in the area, with eleven-digit dialing necessary from landlines.[10]
^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.
^. California Public Utilities Commission. Archived from the original on 2015-02-26. Retrieved 2015-02-25.
^Rubenstein, Steve (2015-02-20). "415, meet 628: New S.F. area code debuts Saturday". SFGate. Retrieved 2020-04-26.
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Area codes 415 and 628 are telephone area codes in the North American Numbering Plan NANP for the city of San Francisco and its northern suburbs in Marin County across the Golden Gate and the northeast corner of 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 in that numbering plan area in mitigation of central office prefix exhaustion Numbering plan areas in California blue and border states Area codes 415 and 628 are shown in red Contents 1 History 2 Service area 2 1 City and County of San Francisco 2 2 Marin County 2 3 San Mateo County 3 See also 4 References 5 External linksHistory EditWhen the North American Numbering Plan was installed by AT amp T 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 1 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 in the south 2 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 to the Oregon border while 916 was redrawn to comprise the northeastern corner of the state 3 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 4 In 1953 the entire Bay Area was reunited in using area code 415 Area code 415 has been split three times due to the Bay Area s rapid economic growth and demand for telecommunication services On March 1 1959 area code 707 was created from the northern part and area code 408 was created for San Jose the South Bay the Monterey Bay and the Salinas Valley 5 408 has since been split to 831 and overlaid with 669 On September 2 1991 area code 510 was created for the East Bay including Oakland 6 510 has since been split to 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 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 7 and portions of Brisbane and Daly City which remained in 415 8 On February 21 2015 the numbering plan area was transitioned to an overlay plan by adding area code 628 to the same service area for new numbers 9 making ten digit dialing mandatory in the area with eleven digit dialing necessary from landlines 10 Service area EditCity and County of San Francisco Edit San FranciscoMarin County Edit Bel Marin Keys Belvedere Black Point Green Point Bolinas California Park Corte Madera Dogtown Fairfax Greenbrae Inverness Park Inverness Kentfield Lagunitas Forest Knolls Larkspur Lucas Valley Marinwood Manor Marconi Marin City Marshall McNears Beach Mill Valley Muir Beach Nicasio Novato Olema Paradise Cay Point Reyes Station Ross San Anselmo San Geronimo San Quentin San Rafael Santa Venetia Sausalito Sleepy Hollow Stinson Beach Strawberry Tamalpais Homestead Valley Tiburon Woodacre San Mateo County Edit Brisbane Daly CitySee also EditList of California area codes List of NANP area codesReferences Edit Mabbs Ralph I Winter 1947 1948 Nation wide Operator Toll Dialing the Coming Way Bell Telephone Magazine 26 4 181 Retrieved 2022 12 26 Madison Linc 1999 05 27 LincMad s 1947 Area Code Map Archived from the original on 4 January 2007 Retrieved 2007 01 06 Moore Carl 1996 02 12 history of area splits TELECOM Digest Archived from the original on 10 July 2012 Retrieved 2007 01 06 Cuccia Mark 1996 08 13 Re When Was Direct Distance Dialing Cut In TELECOM Digest Retrieved 2007 01 06 Madison Linc NANP Area Code History 1948 1959 Archived from the original on 2002 09 11 Retrieved 2007 01 06 Fabisch M P 1990 06 13 NANPA Revised Date for Split of 415 California Numbering Plan Area PDF Bellcore Letter Archived from the original PDF on 2011 06 04 Retrieved 2007 01 06 AT amp T News Room Att com 1998 01 28 Retrieved 2012 09 07 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 06 415 Area Code California Public Utilities Commission Archived from the original on 2015 02 26 Retrieved 2015 02 25 Rubenstein Steve 2015 02 20 415 meet 628 New S F area code debuts Saturday SFGate Retrieved 2020 04 26 External links EditNANPA area code map of California List of exchanges from AreaCodeDownload com 415 Area CodeCalifornia area codes 209 213 323 279 916 310 424 341 510 408 669 415 628 442 760 530 559 562 619 858 626 650 657 714 661 707 747 818 805 820 831 840 909 925 949 951 North 707West Pacific Ocean 808 area code 415 628 East 510 341 925South 650Hawaii area codes 808Coordinates 38 00 N 122 36 W 38 N 122 6 W 38 122 6 Retrieved from https en wikipedia org w index php title Area codes 415 and 628 amp oldid 1151098392, wikipedia, wiki, book, books, library,
