what county is charleroi pa in
Charleroi, Pennsylvania. Charleroi (/ËÊÉËlÉrÉÉª/ SHAW-lÉ-roy) is a borough in Washington County, Pennsylvania, along the Monongahela River, 21 miles south of Pittsburgh. Charleroi was settled in 1890 and incorporated in 1891. The 2010 census recorded a population of 4,120.