The value of farms, ranches, hunting land and other land for sale in Darke County, Ohio, recently on Land.com was approximately $19 million. This represents around 1,000 acres of land and rural real estate for sale in Darke County. Darke County ranks 58th in the Buckeye State for the combined amount of land currently advertised for sale. Of all locations in Darke County with land and rural real estate for sale, Greenville featured the most land for sale. From an economic perspective, manufacturing and related services are the main sectors in Darke County. Darke County is the 13th biggest county (599 square miles) in Ohio. It's located in the Southwest Ohio region of Ohio.