Harrison, OH has a population of 10,522 and is the 3,795th largest city in the United States. The population density is 2,022 per sq mi which is 685% higher than the Ohio average and 2132% higher than the national average. The median age in Harrison is 36 which is approximately 8% lower than the Ohio average of 39. In Harrison, 69% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 81% of Harrison residents were born in Ohio, 18% were born out of state, 1% were born outside of the United States and 0% were foreign born.