Frederick is a city in Tillman County, Oklahoma, United States. The population was 3,940 at the 2010 census. It is the county seat of Tillman County. This is an agriculture based community primarily with wheat, cotton, and cattle.
The public school team name is the Bombers, and they play football at the Bomber Bowl. Frederick was a football powerhouse, in the 1990s, winning the class 3-A State Championship in 1993, 1994, 1995 and the class 2-A State Championship in 1996.
Frederick is also one of a small number of towns in Oklahoma to still have a Carnegie Library as its public library.