Gratis, OH has a population of 1,008 and is the 15,099th largest city in the United States. The population density is 1,045 per sq mi which is 306% higher than the Ohio average and 1053% higher than the national average. The median age in Gratis is 44 which is approximately 11% higher than the Ohio average of 39. In Gratis, 61% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 77% of Gratis residents were born in Ohio, 22% were born out of state, 0% were born outside of the United States and 1% were foreign born.