There was a combined approximately $17 million of land for sale in Kansas's Riley County recently on Land.com. The total acreage of all Riley County farms, ranches, hunting land and other land for sale was approximately 1,000 acres. Riley County ranks 49th in the Wheat State for the total acreage of land currently advertised for sale. Of all locations in Riley County with land for sale, Manhattan had 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 Kansas's 81st biggest county (622 square miles). It's located in the Tallgrass Prairie Kansas region of Kansas.