Summersville is an unincorporated community in Green County, Kentucky, United States. It lies along Routes 61 and 323 northwest of the city of Greensburg, the county seat of Green County. Its elevation is 804 feet (245 m). Although it is unincorporated, it has a post office, with the ZIP code of 42782. Annually in late July the residents host a festival named "Summersville Days".