Land for sale in Oneida County recently totaled almost $169 million and nearly 6,000 acres. Oneida County ranks fifth based on the combined acreage of land for sale of the 72 counties in the Badger State. Rhinelander featured the most land for sale. Based on its natural assets, tourism and recreation are important factors in the Oneida County economy. Oneida County is the 12th biggest county (1,236 square miles) in Wisconsin. It's located in the North Central Wisconsin region of the state.