The value of all ranches, farms, hunting land and other rural land and acreage for sale in Kansas's Riley County recently was around $19 million, representing a total of 367 acres of land for sale in Riley County. Riley County ranks 43rd in the Wheat State for the total number of acres of land currently advertised for sale. Of all locations in Riley County with land and rural real estate for sale, Manhattan featured the most land for sale. From an economic perspective, government and state-level services contribute most to Riley County's overall GDP. Riley County is the 81st largest county (622 square miles) in Kansas. It's located in the Tallgrass Prairie Kansas region of Kansas.