Lillis is an unincorporated community in Marshall County, Kansas, United States. History Lillis was named for Rev. T. F. Lillis. A post office was opened in Lillis in 1910, and remained in operation until it was discontinued in 1958. The Lillis Gymnasium is on the National Register of Historic Places. References Further reading External links Marshall County maps: Current, Historic, KDOT Unincorporated communities in Marshall County, Kansas Unincorporated communities in Kansas