Land for sale in Adams County recently totaled around $17 million and nearly 1,000 acres. Adams County ranks 35th out of 39 counties in the state for the total acreage of land currently advertised for sale. Of all land for sale in Adams County, Othello featured the most land for sale. Agriculture and farming drives the Adams County economy, with 713 farms recorded in the county during the U.S. Census in 2012. 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.