A total of nearly 1,000 acres were listed for sale in Delaware County, Iowa, recently, representing a combined nearly $7 million in Delaware County land and rural real estate for sale. Delaware County ranks 88th out of 99 counties in the Cyclone State for the combined amount of land currently advertised for sale. Manchester had the most land for sale. Manufacturing and related services are the largest economic sectors in Delaware County. Delaware County is the 35th biggest county (578 square miles) in Iowa. It's located in the Eastern Iowa region of Iowa.