List of all Sioux City 300 races held in AAA National Motor Car Championship championships
| Race | Winner | Track | Race Start | |
|---|---|---|---|---|
 |
1914 Sioux City 300 |
Michael Andretti Reynard 94I |
Sioux City | 4th July 1914 |
|
1915 Sioux City 300 |
Paul Tracy Lola T95/00 |
Sioux City | 3rd July 1915 |