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From Wikipedia, the free encyclopedia

Area code 716Area code 585Area code 607Area code 845Area codes 973 and 862Area code 908Area codes 410 and 443Area code 302Area codes 240 and 301Area codes 304 and 681Area codes 330 and 234Area code 440Area code 724Area code 878Area code 724Area code 814Area codes 272 and 570Area codes 484 and 610Area code 856Area codes 215, 267, and 445Area codes 609 and 640Area codes 223 and 717Area code 412Area code 412
Pennsylvania (blue) with numbering plan area 412 shown in red.

Area code 412 is a telephone area code in the North American Numbering Plan (NANP) for the Commonwealth of Pennsylvania. The numbering plan area (NPA) comprises the city of Pittsburgh, most of surrounding Allegheny County, and small portions of Washington and Westmoreland counties. The area code was one of the original North American area codes created in 1947, when it was assigned to the entire southwestern corner of the state.

History

When the American Telephone and Telegraph Company (AT&T) created the first nationwide telephone numbering plan for the continental United States and Canada in 1947, Pennsylvania was divided into four numbering plan areas. Area code 412 was assigned to the southwestern part of the state, from Butler County to the West Virginia border.

On February 1, 1998, nearly all of the old 412 territory outside of Allegheny County was split off and received area code 724, surrounding 412. Bell Atlantic, the main telephone provider at the time in Pennsylvania, preferred to implement it as an overlay to spare residents and businesses the burden of changing telephone numbers. However, overlays were still a new concept at the time, and met with some resistance because of the need for ten-digit dialing. As a result, 724 was implemented as an area code split, making it one of the six pairs of doughnut area codes in North America.

This configuration was intended as a long-term solution, but within two years both 412 and 724 still experienced high demand for telephone services from the proliferation of cell phones and pagers, so that further relief became necessary. By this time, overlays had gained more acceptance, so that area code 878 was overlaid onto both 412 and 724 on August 17, 2001. Although telephone numbers were not assigned for 878 until 2013 (and were only assigned in the 724 area after 412 runs out of central office prefixes), ten-digit dialing has been mandatory across southwestern Pennsylvania since 2001.

Service area

The numbering plan area includes Allegheny county with the exception of its northern edge served by Consolidated Communications, formerly North Pittsburgh Telephone Company, and parts of Washington and Westmoreland counties. Specifically, it comprises the following municipalities: Pittsburgh, Bethel Park, Penn Hills, Plum, Carnegie, West Mifflin, Fox Chapel, Franklin Park, McCandless, McKeesport, Millvale, Monroeville, Mount Lebanon, Mount Oliver, Oakmont, Robinson Township, Ross Township, Sewickley, Shaler Township, South Fayette, Upper Saint Clair, The Borough West View

See also

List of Pennsylvania area codes

External links

Pennsylvania area codes: 215/267/445, 223/717, 272/570, 412, 484/610, 724, 814/582, 878
North: 724/878
West: 724/878 Area code 412, overlaid and surrounded by 878 East: 724/878
South: 724/878

This page was last edited on 15 July 2021, at 12:03
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