Marshallville, OH has a population of 718 and is the 17,308th largest city in the United States. The population density is 1,244 per sq mi which is 383% higher than the Ohio average and 1273% higher than the national average. The median age in Marshallville is 38 which is approximately 4% lower than the Ohio average of 39. In Marshallville, 63% of the population over 15 years of age are married, 96% speak English and 0% speak Spanish. 86% of Marshallville residents were born in Ohio, 13% were born out of state, 0% were born outside of the United States and 1% were foreign born.