There was a total of approximately $8 million of land for sale in Washington's Columbia County recently on Land.com. The total of all Columbia County farms and ranches for sale was approximately 4,000 acres. Columbia County ranks 39th out of 39 counties in the Evergreen State for the total acreage of land currently advertised for sale. Among cities in Columbia County with farms and ranches for sale, Dayton had the most land for sale. Agriculture and farming drives the Columbia County economy, with 308 farms recorded in the county during the U.S. Census in 2012. Farming activities in Columbia County generate annual revenues of $3 million, most of which is from crops. Columbia County is the 31st largest county (873 square miles) in Washington. It's located in the Eastern Washington region of Washington.