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County in Pennsylvania, United States

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. 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. 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.

Formed from Lancaster, Northumberland, and later Bedford counties, Westmoreland County was founded on February 26, 1773, and was the first county in the Pennsylvania colony 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. It is named after Westmorland, a historic county of England.

According to the U. S. Census Bureau, the county has a total area of 1036 square miles (2,683 km2), of which 1028 square miles (2,663 km2) is land and 8.5 square miles (22 km2) (0.8%) is water.

Westmoreland has a humid continental climate (Dfa/Dfb). Average monthly temperatures in Greensburg range from 28.7 °F in January to 71.8 °F in July, while in Murrysville they range from 29.4 °F in January to 73.1 °F in July, in Latrobe they range from 28.9 °F in January to 72.0 °F in July, and in Ligonier they range from 28.1 °F in January to 71.1 °F in July.

At the 2010 census, there were 365,169 people, 153,650 households and 101,928 families residing in the county. The population density was There were 168,199 housing units at an average density of The racial makeup of the county was 95.3% White, 2.3% Black or African American, 0.1% Native American, 0.7% Asian, 0.03% Pacific Islander, 0.2% from other races, and 1.2% from two or more races. 0.9% of the population were Hispanic or Latino of any race. There were 153,650 households, of which 24.5% had children under the age of 18 living with them, 52.2% were married couples living together, 10.0% had a female householder with no husband present, and 33.7% were non families. 29.0% of all households were made up of individuals, and 13.3% had someone living alone who was 65 years of age or older. The average household size was 2.32, and the average family size was 2.86. 22.3% of the population were under 18, 5.1% from 18 to 24, 22.4% from 25 to 44, 31.3% from 45 to 64, and 18.9% who were 65 years of age or older. The median age was 45.1 years. For every 100 females, there were 94.8 males. For every 100 females age 18 and over, there were 92.3 males.

+Westmoreland County Racial CompositionRaceNum. Perc. White (NH)323,11491.1%Black or African American (NH)8,9852.53%Native American (NH)2950.1%Asian (NH)3,3011%Pacific Islander (NH)360.01%Other/Mixed (NH)13,7023.86%Hispanic or Latino5,2301.47%

As of March 4, 2024, there are 245,262 registered voters in Westmoreland County. Republican: 123,872 (50.51%)
Democratic: 90,891 (37.06%)
Independent: 20,536 (8.37%)
Minor parties: 9,963 (4.06%)

Coal mining became a major industry in the county after the Civil War, followed by the expansion of iron, steel, and glass manufacturing. The 600 acre coke works for the Isabella Furnace were built in Cokeville (then Coketown) in the Spring of 1872. At one point, company "coal patches" (towns built for miners) represented about one third of the county's settlements. A major strike by coal miners represented by the United Mine Workers of America took place in 1910–1911. Sixteen people were killed in the strike. In 2020, the top industries in the county were health care and social services (16.3% of jobs), manufacturing (13.8%), and retail trade (13.7%). Mining comprised less than 1% of the jobs in the county. Westmoreland County is now believed to be the site of over 100 abandoned mines. Volkswagen's Westmoreland plant near New Stanton in Westmoreland County was the first foreign owned factory mass producing automobiles in the U. S. It operated from 1978 to 1988.

Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and, in at most two cases, towns. The following cities, boroughs, and townships are located in Westmoreland County: