A total of 4,000 acres were listed for sale in Columbia County, Washington, recently, representing a combined almost $7 million in Columbia County farms, ranches, and rural real estate for sale. Columbia County ranks 39th out of 39 counties in Washington for the combined amount of land currently advertised for sale. Dayton featured the most land for sale. Its economy is defined as agricultural, with 308 farms recorded in the county during the most recent 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.