[2] The Dusmal House and Mingo Creek Presbyterian Church and Churchyard are listed on the National Register of Historic Places.

Across the Monongahela River in Allegheny County, Union Township runs adjacent with Forward Township in Allegheny County.

The separate borough of Finleyville is located entirely within the west-northwest section of the township.

At the 2000 census there were 5,599 people, 2,300 households, and 1,674 families living in the township.

There were 2,376 housing units at an average density of 154.6 per square mile (59.7/km2).