Finleyville is a borough in Washington County, Pennsylvania, United States, named for John Finley. The population was 461 at the 2010 census. It was built at the junction of Brownsville Road (now Pennsylvania Route 88 ) and the 'Washington Road' from Cox's Fort to Catfish Camp, now Washington, Pennsylvania. It was originally known as "Rowgalley" until after a large contingent of Scots-Irish came to town including a number of "Finleys." Reporter Ben Finley's family originates from Finleyville. It is in the Peters Creek watershed.
Finleyville is located at 40°15′10″N 80°0′13″W (40.252662, -80.003505).
According to the United States Census Bureau, the borough has a total area of 0.2 square miles (0.52 km2), all of it land.
As of the census of 2000, there were 459 people, 240 households, and 112 families residing in the borough. The population density was 2,729.7 inhabitants per square mile (1,053.9/km2). There were 271 housing units at an average density of 1,611.6 per square mile (615.5/km2). The racial makeup of the borough was 91.72% White, 5.88% African American, 0.87% Asian, 0.22% from other races, and 1.31% from two or more races.