Blackwell 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 A. J. Blackwell. Blackwell has an agricultural and fossil fuel based economy.
The Top of Oklahoma Historical Society Museum is located in the Electric Park Pavilion and displays artifacts from the land run, antiques, and local history. Blackwell hosts the Kay County Free Fair in September, and the Tulips Abloom Festival in the springtime. Blackwell is served by 5 major parks including Riverside, Bagby, Rogers, Memorial, and Legion parks. Blackwell has 1 major and 2 minor public pools. Blackwell is also home to a brick WPA armory which is listed on the National Register of Historic Places.