There was a total of almost $13 million of farms, ranches, and rural real estate for sale in Riley County recently on Land.com. The total size of all Riley County farms and ranches for sale was nearly 1,000 acres. Riley County ranks 53rd out of 105 counties in the state for the total number of acres of land currently advertised for sale. Among cities in Riley County with farms and ranches for sale, Manhattan featured the most land for sale. Government and state-level services are the main economic drivers in Riley County. Riley County is the 81st biggest county (622 square miles) in Kansas. It's located in the Tallgrass Prairie Kansas region of Kansas.