The value of all farms, ranches, and rural real estate for sale in Sumner County recently was nearly $10 million, representing a combined 1,589 acres of land for sale in Sumner County. Sumner County ranks 32nd in the Jayhawk State for the combined amount of land currently advertised for sale. Among cities in Sumner County with farms, ranches, hunting land and other land for sale, Wellington had the most land for sale. Sumner County is one of the ten largest counties in Kansas (1,184 square miles). It's located in the Tallgrass Prairie Kansas region of the state.