Sun City, one of the villages of Barber county, is located on the Atchison, Topeka & Santa Fe R. R., 20 miles northwest of Medicine Lodge, the county seat. It is on the Medicine Lodge river and in Sun township. There are express and telegraph offices and a money order postoffice. The population in 1910 was 150.
(Kansas: A Cyclopedia of State History, Embracing Events, Institutions, 1912, edited by Frank Wilson Blackmar, Vol. 2, Page 789)
Sun City was founded in 1872. The first post office in Sun City was established in August 1873.
(Source: Wikipedia, the free encyclopedia)