Knoxville Raceway is a semi-banked 1/2 mile dirt oval raceway located at the Marion County Fairgrounds in Knoxville, Iowa, USA. Races at the "Sprint Car Capital of the World" are held on Saturday nights from April through September each year. Some special events may start as early as Wednesday and build up to Saturday. Regular events include 305 cubic inch, 360 cubic inch and 410 cubic inch sprint car racing. Each August, the Raceway holds the paramount sprint car event in the United States, the Knoxville Nationals.