Where Is Area Code 878?
Area code 878 serves Pittsburgh and much of southwestern Pennsylvania. It is a geographic overlay in the Mid-Atlantic region, and it shares the service territory of area codes 412 and 724 rather than defining a separate city boundary.
Coverage includes Pittsburgh and most of Allegheny County, along with communities in Armstrong, Beaver, Butler, Fayette, Greene, Indiana, Lawrence, Mercer, Washington, and Westmoreland counties. The region includes the Pittsburgh urban area, the Ohio River Valley, and towns in the surrounding Appalachian hills.
Pittsburgh’s Point State Park sits at the meeting point of the Allegheny and Monongahela rivers. Those rivers form the Ohio River, making the confluence one of the area’s best-known geographic features.
Cities and Communities in the 878 Area Code
- Aliquippa, Beaver County
- Ambridge, Beaver County
- Beaver, Beaver County
- Beaver Falls, Beaver County
- Bethel Park, Allegheny County
- Butler, Butler County
- Canonsburg, Washington County
- Carnegie, Allegheny County
- Connellsville, Fayette County
- Coraopolis, Allegheny County
- Duquesne, Allegheny County
- Greensburg, Westmoreland County
- Indiana, Indiana County
- Kittanning, Armstrong County
- Latrobe, Westmoreland County
- McKeesport, Allegheny County
- Monroeville, Allegheny County
- Mount Lebanon, Allegheny County
- New Castle, Lawrence County
- New Kensington, Westmoreland County
- Pittsburgh, Allegheny County
- Uniontown, Fayette County
- Washington, Washington County
- Waynesburg, Greene County
- West Mifflin, Allegheny County
- Wilkinsburg, Allegheny County
History of Area Code 878
Area code 878 was put into service on August 1, 2001, as an overlay for area codes 412 and 724. An overlay adds a new area code across an existing service region, so 878 did not create a separate geographic district or require existing customers to change their telephone numbers.
Area code 412 was one of the original North American area codes assigned in 1947. Area code 724 split from 412 in 1998 as southwestern Pennsylvania needed more telephone number capacity. The 878 overlay later added more assignable numbers without another geographic split and made 10-digit dialing necessary for local calls in the affected region.
Key Facts About Area Code 878
- Area code 878 is a geographic area code in Pennsylvania, with Pittsburgh as its primary city.
- Area code 878 serves the Mid-Atlantic region of the United States.
- Area code 878 overlays area codes 412 and 724 across southwestern Pennsylvania.
- Area code 878 entered service on August 1, 2001.
- Area code 878 uses Eastern Time.
- The University of Pittsburgh and Carnegie Mellon University are located in Pittsburgh, within the 878 geographic area.
- Point State Park is located in Pittsburgh at the confluence of the Allegheny and Monongahela rivers.
- Local calls within the 878 overlay territory use 10-digit dialing, including the area code.
Frequently Asked Questions
What state is area code 878 in?
Area code 878 is in Pennsylvania.
What major cities use area code 878?
Pittsburgh, McKeesport, Monroeville, Butler, Greensburg, Indiana, New Castle, Uniontown, and Washington use numbers within the 878 overlay region.
What time zone is area code 878 in?
Area code 878 is in Eastern Time.
Is area code 878 a toll-free number?
No. Area code 878 is a geographic area code, not a toll-free code.