Charleroi is a borough in Washington County, Pennsylvania. It is located in the western part of the state, and it's only 25 miles away from Pittsburgh, making it part of the Pittsburgh Metropolitan Area. According to the United States Census Bureau, as of 2000 Charleroi has a population of 4,871. The borough has a total area of 0.9 square miles of which, 0.8 square miles of it is land and 0.1 square miles of it is water. The population of Charleroi is high at 6,308.6 per square mile. The racial makeup of Charleroi is 95.32% White, 3.24% African American, 0.12% Native American, 0.29% Asian, 0.23% from other races, and 0.80% from two or more races. Hispanic or Latino of any race were 0.72% of the population. Washington County is surrounded by five counties in western Pennsylvania and four counties of West Virginia. The county has a population of approximately 200,000 people living in an area of 861 square miles, of which less than 1% is water. Washington County has 33 boroughs, 32 townships, and 9 census-designated areas. The county seat is the city of Washington.

Washington County is served by local higher education institutions of Washington & Jefferson College, California University of Pennsylvania, Community College of Allegheny County and University of Phoenix. The county is served by more than a dozen public school districts. Three hospitals serve Washington County, The Washington Hospital, Canonsburg General Hospital, Monongahela Valley Hospital. Washington County was the location of the historic event of the Whiskey Rebellion in 1791. The home of David Bradford, one of the famous rebels, is located in Washington and is a national landmark.