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