Carbon Hill, OH has a population of 350 and is the 21,607th largest city in the United States. The population density is 865 per sq mi which is 236% higher than the Ohio average and 855% higher than the national average. The median age in Carbon Hill is 40 which is approximately 2% higher than the Ohio average of 39. In Carbon Hill, 58% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 91% of Carbon Hill residents were born in Ohio, 9% were born out of state, 0% were born outside of the United States and 0% were foreign born.