Finleyville is a borough in Washington County, Pennsylvania, United States, named for John Finley.

[4] It was originally known as "Rowgalley" until after a large contingent of Scots-Irish came to town including a number of "Finleys.

[6] According to the United States Census Bureau, the borough has a total area of 0.2 square miles (0.52 km2), all land.

There were 271 housing units at an average density of 1,611.6 per square mile (622.2/km2).

50.0% of all households were made up of individuals, and 18.8% had someone living alone who was 65 years of age or older.