Ehrhardt, SC has a population of 456 and is the 20,107th largest city in the United States. The population density is 147 per sq mi which is 1% lower than the South Carolina average and 62% higher than the national average. The median age in Ehrhardt is 50 which is approximately 28% higher than the South Carolina average of 39. In Ehrhardt, 53% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 82% of Ehrhardt residents were born in South Carolina, 18% were born out of state, 1% were born outside of the United States and 0% were foreign born.