The value of all farmsand rural real estate for sale in Michigan's Mackinac County recently was approximately $37 million, representing a combined 2,592 acres of land for sale in Mackinac County. Mackinac County ranks 74th in the state for the combined amount of land currently advertised for sale. Of all farms, hunting land and other rural land and acreage for sale in Mackinac County, Curtis had the most land for sale. Based on its natural assets, tourism and recreation are important sectors for the Mackinac County economy. Mackinac County is one of the ten biggest counties in Michigan (2,100 square miles). It's located in the Upper Peninsula Michigan region of the state.