Oneida, TN has a population of 3,731 and is the 7,762nd largest city in the United States. The population density is 400 per sq mi which is 139% higher than the Tennessee average and 341% higher than the national average. The median age in Oneida is 38 which is approximately 1% lower than the Tennessee average of 39. In Oneida, 55% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 75% of Oneida residents were born in Tennessee, 25% were born out of state, 0% were born outside of the United States and 0% were foreign born.