Hayne, KansasHayne is an unincorporated community in Seward County, Kansas, United States. It is located northeast of Liberal along U.S. Route 54 highway.HistoryA post office was opened in Hayne in 1908, and remained in operation until it was discontinued in 1925.EducationThe community is served by Southwestern Heights USD 483 public school district. Its high school, Southwestern Heights, is located between Kismet and Plains along U.S. Route 54 highway.