The overall value of farms and ranches for sale in Benton County, Washington, recently on Land.com was around $357 million. This represents nearly 4,000 acres of ranches, farms, hunting land and other rural land and acreage for sale in Benton County. Benton County ranks first out of 39 counties in the Evergreen State for the combined amount of land currently advertised for sale. Kennewick featured the most land for sale. Benton County is Washington's 23rd biggest county (1,759 square miles). It's located in the Eastern Washington region of Washington.