The value of all farms, ranches, hunting land and other land for sale in Darke County recently was around $16 million, representing a total of 360 acres of land for sale in Darke County. Darke County ranks 61st out of 88 counties in the state for the total acreage of land currently advertised for sale. Of all locations in Darke County with ranches, farms, hunting land and other rural land and acreage for sale, Greenville had the most land for sale. Manufacturing and related services are the largest economic sectors in Darke County. Darke County is Ohio's 13th biggest county (599 square miles). It's located in the Southwest Ohio region of Ohio.