Westmoreland County, Pennsylvania

Westmoreland County
Location within the U.S. state of Pennsylvania
Pennsylvania's location within the U.S.
Coordinates: 40°19′N 79°28′W / 40.31°N 79.47°W / 40.31; -79.47
Country United States
State Pennsylvania
FoundedFebruary 26, 1773
Named afterWestmorland
SeatGreensburg
Largest cityHempfield Township
Area
  Total
1,036 sq mi (2,680 km2)
  Land1,028 sq mi (2,660 km2)
  Water8.5 sq mi (22 km2)  0.8%
Population
 (2020)
  Total
354,663
  Density345/sq mi (133/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional districts12th, 14th
Websitewww.westmorelandcountypa.gov

Westmoreland County is a county in the state of Pennsylvania, United States, in the Pittsburgh Metropolitan Statistical Area. As of the 2020 census the population was 354,663. The county seat is Greensburg and the most populous community is Hempfield Township. It is named after Westmorland, a historic county of England. The county is part of the Southwest Pennsylvania region of the state.