Area code 878

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Area code 716 Area code 585 Area code 607 Area code 845 Area codes 862 and 973 Area code 908 Area codes 410 and 443 Area code 302 Area codes 240 and 301 Area codes 304 and 661 Area codes 234 and 330 Area code 440 Area code 724 Area code 878 Area code 724 Area code 814 Area codes 272 and 570 Area codes 484 and 610 Area code 856 Area codes 215 and 267 Area code 609 Area codes 223 and 717 Area code 412Area code 878
Pennsylvania (blue) with numbering plan area 878 shown in red. Note that this map is clickable; click on any area code to go to the page for that area code.

Area code 878 is an overlay area code in Southwestern Pennsylvania, centered in Pittsburgh. It simultaneously overlays the region's two existing area codes, 412 and 724, making ten-digit dialing mandatory in the Pittsburgh area.

412 had served southwestern Pennsylvania for 41 years before 724 was created for most of the old 412 territory outside of Pittsburgh in 1998. Bell Atlantic (now part of Verizon), the main telephone provider in the area, wanted to implement 724 as an overlay to spare residents and businesses the burden of changing their numbers. However, overlays were still a new concept at the time, and met with considerable resistance due to the need for ten-digit dialing. Thus, the proposal was changed to a geographic split. Within two years, however, both 412 and 724 were on the verge of exhaustion due to the Pittsburgh area's rapid growth and the proliferation of cell phones and pagers. Overlays had gained more acceptance by then, so 878 was implemented as an overlay. It came into effect on August 17, 2001.

Although ten-digit dialing has been mandatory in southwestern Pennsylvania since 2001, no 878 numbers were assigned for more than a decade due to number-conservation procedures implemented in both Pittsburgh itself and the suburbs. On February 15, 2013, the Pennsylvania Public Utility Commission announced it would start to issue 878 numbers in the 724 territory sometime within the next year, as 724 was nearly exhausted.[1] At the moment, numbers from the 878 area code will not be assigned in Pittsburgh itself (the 412 area) until it runs out of numbers as well.[2]

The first 878 numbers were assigned in April 2013, nearly 12 years after the overlay was activated.[3]

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See also[edit]

Pennsylvania area codes: 215/267, 223/717, 272/570, 412, 484/610, 724, 814, 878
North: 814
West: 234/330, 304/681 Area code 878 (overlays 412 and 724) East: 814
South: 304/681
Ohio area codes: 216, 220/740, 234/330, 380/614, 419/567, 440, 513, 937
West Virginia area codes: 304/681

Coordinates: 40°01′37″N 79°54′50″W / 40.027°N 79.914°W / 40.027; -79.914