The value of all land and rural real estate for sale in Columbia County, Washington, recently was around $7 million, representing a combined 3,388 acres of land for sale in Columbia County. Columbia County ranks 39th out of 39 counties in the state for the total acreage of land currently advertised for sale. Of all farms, ranches, hunting land and other land for sale in Columbia County, Dayton featured the most land for sale. Columbia County has a large agricultural economy, with 308 farms recorded in the county during the latest U.S. Census. 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.