The value of all land and rural real estate for sale in Adams County, Iowa, recently was around $4 million, representing a total of 379 acres of land for sale in Adams County. Adams County ranks 95th in the state for the combined amount of land currently advertised for sale. Corning featured the most land for sale. Manufacturing and related services are the largest economic sectors in Adams County. Adams County is the 92nd largest county (425 square miles) in Iowa. It's located in the Western Iowa region of Iowa.