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is a city in Kay County, Oklahoma, United States, located at the intersection of U.S. Highway 177 and State Highway 11 along Interstate 35. The population was 7,668 at the 2000 census.
Blackwell was established following the September 16, 1893 Cherokee Outlet land run by the self-proclaimed Col. A. J. Blackwell.
On May 25, 1955, a deadly F5 tornado struck Blackwell at approx. 9:30pm and cut a swath of destruction through the northeastern portion of city, roughly centered in the neighborhoods surrounding Riverside Park. 20 residents died and 250 were injured. This tornado was part of a significant tornado outbreak across the Central Plains which included another F5 tornado that struck Udall, Kansas killing 82 people and injuring 270.. The outbreak spawned 19 tornadoes across Oklahoma, Texas and Kansas alone.