Clintonville is a borough in Venango County, Pennsylvania, United States. The population was 528 at the 2000 census.Clintonville is located at 41°11′58″N 79°52′28″W / 41.19944°N 79.87444°W / 41.19944; -79.87444.According to the United States Census Bureau, the borough has a total area of 1.1 square miles, all of it land.As of the census of 2000, there were 528 people, 215 households, and 147 families residing in the borough. The population density was 463.5 people per square mile. There were 242 housing units at an average density of 212.4 per square mile. The racial makeup of the borough was 97.16% White, 1.52% African American, 0.57% Native American, 0.19% from other races, and 0.57% from two or more races. Hispanic or Latino of any race were 0.19% of the population.There were 215 households out of which 35.8% had children under the age of 18 living with them, 51.2% were married couples living together, 10.2% had a female householder with no husband present, and 31.