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is a city in Marion County, Iowa, United States. The population was 7,731 at the 2000 census. It is the county seat of Marion County. Knoxville is home of the National Sprint Car Hall of Fame & Museum located next to the famous dirt track known as Knoxville Raceway.
According to the United States Census Bureau, the city has a total area of 4.4 square miles (11.5 km²), all of it land.