It has been represented by Republican Rick Billinger since 2017, succeeding fellow Republican Ralph Ostmeyer.

[2] District 40 covers a vast swath of rural northwestern Kansas, including all of Cheyenne, Decatur, Ellis, Gove, Graham, Logan, Norton, Rawlins, Sheridan, Sherman, Thomas, Trego, and Wallace Counties and part of Phillips County.

Communities in the district include Hays, Colby, Goodland, Norton, Ellis, Oakley, WaKeeney, Oberlin, St. Francis, Hill City, Hoxie, and Atwood.

[4] It borders the states of Nebraska and Colorado.

At nearly 13,000 square miles, it is by far the largest legislative district in the state.