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.