Land for sale in Kansas's Sumner County recently totaled $14 million and around 2,000 acres. Sumner County ranks 27th out of 105 counties in the state for the total acreage of land currently advertised for sale. There were two properties listed as sold in Sumner County through the Land Network Comparable Sales Program. This represented a total value of $974,000. 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 Kansas.