There was a combined around $151 million of farms, hunting land and other rural land and acreage for sale in Washington County recently on Land.com. The total acreage of all Washington County land and rural real estate for sale was nearly 300,000 acres. Based on the combined acreage of land and rural property for sale here, Washington County has the most land for sale of all counties in the Gopher State. Of all locations in Washington County with farms and rural real estate for sale, Forest Lake had the most land for sale. Washington County is the 83rd largest county (422 square miles) in Minnesota. It's located in the Twin Cities Minnesota region of Minnesota.