Land for sale in Mills County, Iowa, recently totaled $16 million and 1,000 acres. Mills County ranks 40th out of 99 counties in the Cyclone State for the total number of acres of land currently advertised for sale. Of all locations in Mills County with land for sale, Glenwood featured the most land for sale. From an economic perspective, government and state-level services contribute most to Mills County's overall GDP. Mills County is the 80th largest county (440 square miles) in Iowa. It's located in the Western Iowa region of the state.