There was a combined nearly $30 million of land and rural real estate for sale in Shiawassee County, Michigan, recently on Land.com. The total of all Shiawassee County land for sale was nearly 1,000 acres. Shiawassee County ranks 58th out of 83 counties in the Wolverine State for the total number of acres of land currently advertised for sale. Of all locations in Shiawassee County with farms, hunting land and other rural land and acreage for sale, Owosso had the most land for sale. Shiawassee County is the 77th biggest county (540 square miles) in Michigan. It's located in the East Central Michigan region of the state.