The combined value of farms and ranches for sale in Adams County, Washington, recently on Land.com was approximately $39 million. This represents around 1,000 acres of land and rural real estate for sale in Adams County. Adams County ranks 34th in the Evergreen State for the total acreage of land currently advertised for sale. Othello featured the most land for sale. Adams County has a large agricultural economy, with 713 farms recorded in the county during the latest U.S. Census. Farming activities in Adams County generate annual revenues of $24 million, most of which is from crops. Adams County is Washington's 17th biggest county (1,929 square miles). It's located in the Eastern Washington region of the state.