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

Area code 412 is a Commonwealth of Pennsylvania telephone area code which serves Pittsburgh, most of surrounding Allegheny County (except the northern edge of Allegheny County served by Consolidated Communications, formerly the North Pittsburgh Telephone Company) and small portions of Washington and Westmoreland counties.

Area code 412 was one of the original area codes established in 1947. It originally covered the entire southwestern corner 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 into area code 724, which completely surrounds 412. Bell Atlantic, the main telephone provider in Pennsylvania, preferred to implement it as an overlay in order to spare residents the burden of changing their numbers. However, overlays were still a new concept at the time, and met with some resistance due to the need for ten-digit dialing. For this reason, 724 was implemented as a split, making it one of the six pairs of "doughnut area codes" in the numbering plan.

This was intended as a long-term solution, but within two years both 412 and 724 were close to exhaustion once again due to the proliferation of cell phones and pagers. By this time, overlays had gained more acceptance, and for this reason area code 878 was overlaid onto both 412 and 724 on August 17, 2001. Although numbers were not assigned in 878 until 2013 (and are only being assigned in the 724 area until 412 runs out of prefixes), ten-digit dialing has been mandatory across southwestern Pennsylvania since 2001.

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