Onamia is a city located in Mille Lacs County Minnesota. With a 2020 population of 866, it is the 374th largest city in Minnesota and the 10924th largest city in the United States . Onamia is currently growing at a rate of 0.12% annually but its population has decreased by -1.37% since the most recent census, which recorded a population of 878 in 2010. Onamia reached it's highest population of 879 in 2010. Spanning over 1 miles, Onamia has a population density of 912 people per square mile.
The average household income in Onamia is $46,601 with a poverty rate of 23.39%. The median rental costs in recent years comes to $654 per month, and the median house value is $87,300. The median age in Onamia is 42.1 years, 36.2 years for males, and 45.4 years for females.