There was a combined $17 million of farms, rural land, hunting land and other land for sale in Ontonagon County recently on Land.com. The total acreage of all Ontonagon County farms, rural land, hunting land and other land for sale was nearly 4,000 acres. Ontonagon County ranks 73rd out of 83 counties in the Great Lakes State for the total number of acres of land currently advertised for sale. Of all farms and rural real estate for sale in Ontonagon County, Ontonagon featured the most land for sale. Based on its natural assets, tourism and recreation contribute significant revenue toward Ontonagon County's overall GDP. Ontonagon County is one of the ten biggest counties in Michigan (3,740 square miles). It's located in the Upper Peninsula Michigan region of the state.