Oak Hill, TN has a population of 4,686 and is the 6,748th largest city in the United States. The population density is 597 per sq mi which is 290% higher than the Tennessee average and 559% higher than the national average. The median age in Oak Hill is 45 which is approximately 16% higher than the Tennessee average of 39. In Oak Hill, 81% of the population over 15 years of age are married, 95% speak English and 2% speak Spanish. 53% of Oak Hill residents were born in Tennessee, 41% were born out of state, 2% were born outside of the United States and 3% were foreign born.