Forest Park, OH has a population of 18,679 and is the 2,339th largest city in the United States. The population density is 2,884 per sq mi which is 1020% higher than the Ohio average and 3083% higher than the national average. The median age in Forest Park is 37 which is approximately 6% lower than the Ohio average of 39. In Forest Park, 52% of the population over 15 years of age are married, 85% speak English and 5% speak Spanish. 69% of Forest Park residents were born in Ohio, 19% were born out of state, 1% were born outside of the United States and 11% were foreign born.