There were 2,376 housing units at an average density of 154.6 per square mile (59.7/km 2). The population density was 364.3 inhabitants per square mile (140.7/km 2). The separate borough of Finleyville is located entirely within the west-northwest section of the township.Īt the 2000 census there were 5,599 people, 2,300 households, and 1,674 families living in the township. Across the Monongahela River in Allegheny County, Union Township runs adjacent with Forward Township in Allegheny County. Union Township has five land borders, including South Park Township and Jefferson Hills (both in Allegheny County) to the north, Carroll Township to the south, and Nottingham and Peters Townships to the west. Surrounding, adjacent and inner neighborhoods Geography Īccording to the United States Census Bureau, the township has a total area of 15.7 square miles (40.8 km 2), of which, 15.4 square miles (39.8 km 2) of it is land and 0.4 square miles (1.0 km 2) of it (2.41%) is water. The Dusmal House and Mingo Creek Presbyterian Church and Churchyard are listed on the National Register of Historic Places. The population was 5,367 at the 2020 census. Union Township is a township in Washington County, Pennsylvania, United States.

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