
Oneida
- County:
- Knox County
- County Seat:
- No
- Area (mi²):
- 0.763
- State:
- Illinois
Oneida is a city located in Knox County, Illinois. Oneida has a 2025 population of 661. Oneida is currently declining at a rate of -1.05% annually and its population has decreased by -5.03% since the most recent census, which recorded a population of 696 in 2020.
The average household income in Oneida is $77,225 with a poverty rate of 3.38%. The median age in Oneida is 38.8 years: 34.5 years for males, and 42 years for females.