Sumner County is a county located in the U.S. state of Kansas. Its county seat is Wellington. As of the 2020 census, the population was 22,382. The county is named after Charles Sumner, a U.S. Senator from Massachusetts who was a leader of Reconstruction politics.

Butler County is a county in the U.S. state of Kansas and is the largest county in the state by total area. Its county seat is El Dorado and its most populous city is Andover. As of the 2020 census, the county population was 67,380. The county was named for Andrew Butler, a U.S. Senator from South Carolina who coauthored the Kansas–Nebraska Act.