Geographic Regions and Area Codes

Area code 878 is located in southwestern Pennsylvania, primarily centered around Pittsburgh. It forms an overlay complex with area codes 412 and 724, covering the entire Pittsburgh metropolitan area and parts of the surrounding counties. The area code spans 13 counties, including:

  • Allegheny
  • Westmoreland
  • Washington
  • Butler
  • Beaver
  • Fayette
  • Mercer
  • Lawrence
  • Indiana
  • Armstrong

Nearby area codes include 234/330 (Akron, OH), 240/301 (Germantown, MD), 304/681 (West Virginia), 440 (Parma, OH), and 814 (Erie, PA).