Clintonville, PA has a population of 448 and is the 20,238th largest city in the United States. The population density is 411 per sq mi which is 48% higher than the Pennsylvania average and 353% higher than the national average. The median age in Clintonville is 38 which is approximately 7% lower than the Pennsylvania average of 41. In Clintonville, 72% of the population over 15 years of age are married, 97% speak English and 0% speak Spanish. 86% of Clintonville residents were born in Pennsylvania, 13% were born out of state, 1% were born outside of the United States and 0% were foreign born.