Oak Ridge, TN has a population of 29,285 and is the 1,462nd largest city in the United States. The population density is 343 per sq mi which is 124% higher than the Tennessee average and 279% higher than the national average. The median age in Oak Ridge is 42 which is approximately 10% higher than the Tennessee average of 39. In Oak Ridge, 57% of the population over 15 years of age are married, 91% speak English and 4% speak Spanish. 51% of Oak Ridge residents were born in Tennessee, 42% were born out of state, 0% were born outside of the United States and 7% were foreign born.