Oneida is a city located in Knox County, in the state of Illinois (IL), United States. Nestled in the East North Central division of the Midwest region, it covers an area of 0.7 square miles (2.0 km²) and sits at an elevation of 810 ft. With a population of approximately 752 residents, Oneida offers a peaceful, rural atmosphere.
The town's population is composed of about 49.2% males and 50.8% females, and it has a population density of 30.14 people per square mile (397.74/km²). Oneida lies at a latitude of 41.07 and a longitude of -90.22, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (5.2%), followed by English (15.6%), German (20.6%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 61467.