High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Forest Park is a city in Hamilton County, Ohio, United States. The population was 19,463 at the 2000 census making it the third most populous city in Hamilton County, Ohio. According to the United States Census Bureau, the city has a total area of 6.5 square miles (16.9 km²), all of it land. As of the census of 2000, there were 19,463 people, 7,505 households, and 5,238 families residing in the city. The population density was 2,990.4 people per square mile (1,154.3/km²). There were 7,748 housing units at an average density of 1,190.4/sq mi (459.5/km²).