Westmoreland County, Pennsylvania

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Westmoreland County
County
Westmoreland County Courthouse
Flag Seal
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
Founded	February 26, 1773
Named for	Westmorland
Seat	Greensburg
Largest city	Hempfield Township
Area
• Total	1,036 sq mi (2,680 km2)
• Land	1,028 sq mi (2,660 km2)
• Water	8.5 sq mi (22 km2)  0.8%
Population  (2020)
• Total	354,663
• Density	345/sq mi (133/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional districts	13th, 14th
Website	www.co.westmoreland.pa.us

Westmoreland County is a county in the Commonwealth of Pennsylvania, United States, located in the Pittsburgh Metropolitan Statistical Area. As of the 2020 census, the population was 354,663.^[1] The county seat is Greensburg and the most populous community is Hempfield Township.^[2] It is named after Westmorland, a historic county of England. The county is part of the Southwest Pennsylvania region of the state.^[a]

Formed from, successively, Lancaster, Northumberland, and later Bedford counties, Westmoreland County was founded on February 26, 1773, and was the first county in the colony of Pennsylvania whose entire territorial boundary was located west of the Allegheny Mountains. Westmoreland County originally included the present-day counties of Fayette, Washington, Greene, and parts of Beaver, Allegheny, Indiana, and Armstrong counties.

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