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This configuration was intended as a long-term solution, but within two years both 412 and 724 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
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was implemented as an overlay for 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 until 2015), ten-digit dialing has been mandatory across southwestern
Pennsylvania since 2001.
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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.
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to spare residents and businesses the burden of changing telephone numbers, but overlays were still a new concept that met with resistance because of the need for
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created in 1947, when it was assigned to the entire southwestern corner of the state. On August 17, 2001, the numbering plan area was converted to an
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168:, formerly North Pittsburgh Telephone Company, and parts of Washington and Westmoreland counties. It includes the following municipalities:
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On
February 1, 1998, most of southwestern Pennsylvania outside of Allegheny County was divided into a new numbering plan area and assigned
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The numbering plan area includes
Allegheny county, with the exception of its northern edge served by
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315:"Planning Letter PL-281: Rationing in NPAs 412, 724, and 878 (Pennsylvania)"
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Pennsylvania (blue) with numbering plan area 412 shown in red.
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286:"Nation-Wide Operator Toll Dialing—the Coming Way"
504:Telecommunications-related introductions in 1947
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16:Telephone area code for Pittsburgh, Pennsylvania
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115:(AT&T) created the first nationwide
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87:counties. The area code was one of the
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342:NANPA area code map of Pennsylvania
519:1947 establishments in Pennsylvania
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89:original North American area codes
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284:Mabbs, Ralph (Winter 1947–1948).
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514:Area codes in the United States
265:List of Pennsylvania area codes
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61:North American Numbering Plan
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166:Consolidated Communications
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509:Area codes in Pennsylvania
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117:telephone numbering plan
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290:Bell Telephone Magazine
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254:The Borough West View
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145:doughnut area codes
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147:in North America.
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480:40.488°N 79.892°W
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250:Upper Saint Clair
230:Robinson Township
137:ten-digit dialing
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77:Allegheny County
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349:Pennsylvania
322:. Retrieved
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298:. Retrieved
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222:Mount Oliver
190:West Mifflin
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160:Service area
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85:Westmoreland
69:Pennsylvania
65:Commonwealth
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353:215/267/445
214:Monroeville
174:Bethel Park
498:Categories
471:79°53′31″W
468:40°29′17″N
324:2023-06-23
300:2022-04-23
271:References
206:McKeesport
202:McCandless
194:Fox Chapel
178:Penn Hills
170:Pittsburgh
81:Washington
73:Pittsburgh
238:Sewickley
111:When the
57:area code
296:(4): 181
259:See also
210:Millvale
186:Carnegie
377:814/582
369:717/223
361:570/272
226:Oakmont
133:overlay
107:History
59:in the
445:South
390:North
318:(PDF)
95:with
428:East
420:412/
407:West
182:Plum
83:and
453:878
449:724
436:878
432:724
422:878
415:878
411:724
398:878
394:724
381:878
373:724
357:412
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.