Riverside, OH has a population of 25,036 and is the 1,727th largest city in the United States. The population density is 2,580 per sq mi which is 902% higher than the Ohio average and 2748% higher than the national average. The median age in Riverside is 36 which is approximately 9% lower than the Ohio average of 39. In Riverside, 54% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 66% of Riverside residents were born in Ohio, 28% were born out of state, 1% were born outside of the United States and 4% were foreign born.