1915 Des Moines 300 is 128th AAA National Motor Car Championship race. Passed at the Des Moines circuit. Ralph Mulford won the pole position and this race. This was his 10th victory. Ralph de Palma and Eddie O'Donnell also climbed to the podium, in second and third place. Race distance 300 laps (483 km).
Previous race:
1915 Burlington 100
Next race:
1915 Chicago Automobile Club Trophy
10th victory for the Ralph Mulford
17th podium for the Ralph Mulford
17th podium for the Ralph de Palma
10th podium for the Eddie O'Donnell
| Position | Name | Points | Result | Lap | Team |
|---|---|---|---|---|---|
| 1 | Ralph Mulford | 600 | 3h 27m 5.330s | 0 | |
| 2 | Ralph de Palma | 320 | 3h 28m 12.020s+1m 6.690s | 0 | |
| 3 | Eddie O'Donnell | 170 | 3h 31m 45.510s+4m 40.180s | 0 | Duesenberg Bros |
| 4 | WW Brown | 90 | 4h 26m 22.180s+59m 16.850s | 0 | |
| 5 | Winfield Barndollar | 55 | 4h 40m 35.020s+1h 13m 29.690s | 0 | Clergy |
| 6 | Pete Henderson | 35 | 5h 1m 43.250s+1h 34m 37.920s | 0 | Duesenberg Bros |
| 7 | WJ Shrunk | 25 | 5h 9m 34.150s+1h 42m 28.820s | 0 | |
| 8 | Tom Alley | 15 | 5h 10m 13.080s+1h 43m 7.750s | 0 | Duesenberg Bros |
| 9 | AF Scott | 0 | 0 | Anderson | |
| 10 | William Chandler | 0 | 0 | Duesenberg Bros | |
| 11 | Joe Cooper | 0 | 0 | EE Miles & JW Gwin | |
| 12 | Bruno Lombardi | 0 | 0 |
| Position | Name | Result | Team |
|---|---|---|---|
| 1 | Ralph Mulford | 0 | |
| 2 | Ralph de Palma | 0 | |
| 3 | Eddie O'Donnell | 0 | Duesenberg Bros |
| 4 | WW Brown | 0 | |
| 5 | Winfield Barndollar | 0 | Clergy |
| 6 | Pete Henderson | 0 | Duesenberg Bros |
| 7 | WJ Shrunk | 0 | |
| 8 | Tom Alley | 0 | Duesenberg Bros |
| 9 | AF Scott | 0 | Anderson |
| 10 | William Chandler | 0 | Duesenberg Bros |
| 11 | Joe Cooper | 0 | EE Miles & JW Gwin |
| 12 | Bruno Lombardi | 0 |
White
unknown
Stutz
Stutz
Brown
Duesenberg