
Onamia
- County:
- Mille Lacs County
- County Seat:
- No
- Area (mi²):
- 0.982
- State:
- Minnesota
Onamia is a city located in Mille Lacs County, Minnesota. Onamia has a 2025 population of 866. Onamia is currently growing at a rate of 2.12% annually and its population has increased by 11.31% since the most recent census, which recorded a population of 778 in 2020.
The average household income in Onamia is $45,326 with a poverty rate of 27.89%. The median age in Onamia is 44.8 years: 39.4 years for males, and 55.1 years for females.