A combined nearly 1,000 acres were listed for sale in Riley County, Kansas, recently; the combined value of all Riley County farms, ranches, hunting land and other land for sale was $19 million. Riley County ranks 45th in the Wheat State for the combined amount of land currently advertised for sale. Of all farms and ranches for sale in Riley County, Manhattan featured the most land for sale. Government and state-level services are the main economic drivers in Riley County. Riley County is Kansas's 81st biggest county (622 square miles). It's located in the Tallgrass Prairie Kansas region of Kansas.