There was a combined $167 million of farmsand rural real estate for sale in Saint Croix County, Wisconsin, recently on Land.com. The total of all Saint Croix County farms, hunting land and other rural land and acreage for sale was nearly 800,000 acres. Based on the combined acreage of land and rural property for sale here, Saint Croix County has the most land for sale of the 72 counties in the Badger State. Of all land and rural real estate for sale in Saint Croix County, New Richmond featured the most land for sale. Saint Croix County is Wisconsin's 48th largest county (735 square miles). It's located in the Northwest Wisconsin region of the state.