Washington County, Pennsylvania

Washington County, Pennsylvania
Location within the U.S. state of Pennsylvania
Coordinates: 40°11′N 80°15′W / 40.19°N 80.25°W / 40.19; -80.25
Country United States
State Pennsylvania
FoundedMarch 28, 1781
Named afterGeorge Washington
SeatWashington
Largest cityPeters Township
Government
 • Chairman of the Board of CommissionersNick Sherman
Area
 • Total
861 sq mi (2,230 km2)
 • Land857 sq mi (2,220 km2)
 • Water3.9 sq mi (10 km2)  0.5%
Population
 (2020)
 • Total
209,349
 • Estimate 
(2024)
210,434
 • Density240/sq mi (93/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district14th
Websitewashingtoncopa.gov

Washington County is a county in the Commonwealth of Pennsylvania, United States. As of the 2020 census, the population was 209,349. Its county seat is Washington. The county is home to Washington County Airport, three miles (4.8 km) southwest of Washington. The county is part of the Pittsburgh region of the commonwealth. Southpointe is the regions largest business park with over 800 acres of office buildings, manufacturing, hotels, restaurants and a championship golf course. The park is home to corporations Ansys, Viatris, Range Resources, Lighthouse Electric, EQT, Core Natural Resources and Centimark. The current county commissioners are Nick Sherman, Electra Janis and Lawrence Maggi.