Area Code 878 Location

Area code 878 serves Pittsburgh, Pennsylvania, and much of southwestern Pennsylvania through an all-service overlay with area codes 412 and 724. Because these three codes cover the same places, ten-digit dialing is required for all local calls. You’ll see 878 on both mobile and landline phone numbers connected to the Pittsburgh metro and nearby communities. This setup helps add new phone numbers without changing anyone’s existing digits.

Area code 878 covers Pittsburgh and surrounding cities and towns, including:

• Pittsburgh
• Monroeville
• Bethel Park
• Mt. Lebanon
• McKeesport
• Cranberry Township
• Butler
• Greensburg
• Washington (PA)
• New Castle
• Beaver and Beaver Falls These places include major landmarks like Downtown Pittsburgh, Point State Park, and the campuses of the University of Pittsburgh and Carnegie Mellon University. Sports and entertainment hubs such as PNC Park, Acrisure Stadium, and PPG Paints Arena also sit within the overlay region.

The 878 code was assigned in 2001 as an overlay for 412 and 724, and the first 878 numbers began appearing later as demand grew (initial assignments started in 2013). This approach conserved numbering resources while keeping well-known 412 and 724 numbers in use. Pittsburgh’s geography shapes the region’s calling area: the city stands at the meeting point of the Allegheny, Monongahela, and Ohio Rivers. “City of Bridges” is more than a nickname—“Pittsburgh has 446 bridges” (VisitPittsburgh).

If you get a call from an 878 number, it typically originates from the Pittsburgh–southwestern Pennsylvania area. Carriers assign new numbers in any of the overlay codes—878, 412, or 724—based on availability in each community. Number portability lets many residents and businesses keep their numbers when switching carriers or moving within the overlay. In short, 878 expands local phone number supply while keeping Pittsburgh’s familiar dialing landscape intact.