Charleroi, PA has a population of 4,037 and is the 7,410th largest city in the United States. The population density is 5,297 per sq mi which is 1811% higher than the Pennsylvania average and 5747% higher than the national average. The median age in Charleroi is 39 which is approximately 5% lower than the Pennsylvania average of 41. In Charleroi, 45% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 89% of Charleroi residents were born in Pennsylvania, 9% were born out of state, 0% were born outside of the United States and 1% were foreign born.