Onamia (/oʊˈneɪmiːə/ oh-NAYM-ee-ə) is a city in Mille Lacs County, Minnesota, USA. The population was 878 at the 2010 census. It is the town nearest to Camp Onomia, a Lutheran summer camp. Originally, the City of Onamia was organized from merger of two communities: Village of Onamia (Ojibwe: Onamanii-zaaga'iganiing) and the Village of Ericksonville (Ojibwe: Gibaakwa'igaansing).