Oneida is a town in Scott County, Tennessee, United States. The population was 3,752 at the 2010 census.
Oneida is known for its proximity to the Big South Fork National River and Recreation Area. The town is named for Oneida, New York, the home of several railroad executives who helped develop the town in the late 19th century.
Oneida is located at 36°30′2″N 84°31′0″W (36.500535, -84.516553).
According to the United States Census Bureau, the town has a total area of 10.3 square miles (27 km2), of which 10.2 square miles (26 km2) is land and 0.1 square miles (0.26 km2) (1.36%) is water.
As of the census of 2000, there were 3,615 people, 1,588 households, and 986 families residing in the town. The population density was 355.4 people per square mile (137.2/km2). There were 1,715 housing units at an average density of 168.6 per square mile (65.1/km2). The racial makeup of the town was 98.34% White, 0.03% African American, 0.14% Native American, 0.39% Asian, 0.19% from other races, and 0.91% from two or more races. Hispanic or Latino of any race were 0.30% of the population.
There were 1,588 households, out of which 30.8% had children under the age of 18 living with them, 43.3% were married couples living together, 15.4% had a female householder with no husband present, and 37.9% were non-families.