South Amherst, OH has a population of 1,723 and is the 11,910th largest city in the United States. The population density is 697 per sq mi which is 171% higher than the Ohio average and 669% higher than the national average. The median age in South Amherst is 50 which is approximately 27% higher than the Ohio average of 39. In South Amherst, 61% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 80% of South Amherst residents were born in Ohio, 18% were born out of state, 1% were born outside of the United States and 1% were foreign born.