what county is onamia, mn in
Onamia, Minnesota. Onamia (/oÊËneÉªmiËÉ/ oh-NAYM-ee-É) is a city in Mille Lacs County, Minnesota, United States. The population was 878 at the 2010 census. U.S. Highway 169 and Minnesota State Highway 27 are the main routes in the community. Contents.