Elgin National Trophy Race
Elgin Road Race Course
8.384 Mile Road Course
36 Laps/300.456 Miles
August 21, 1915
| Finish | Start | Driver | Car # | Sponsor/Name | Chassis | Engine | Laps | Status |
Points |
| 1 | X | Gil Andersen | 6 | Stutz | Stutz | Stutz | 36 | 3:54:25.87 77.256 | 600* |
| 2 | X | Earl Cooper | 8 | Stutz | Stutz | Stutz | 36 | 3:57:29.46 76.258 | 320* |
| 3 | X | Eddie O'Donnell | 7 | Duesenberg | Duesenberg | Duesenberg | 36 | 3:59:01.80 75.769 | 170* |
| 4 | X | Ralph DePalma | 4 | Mercedes | Mercedes | Mercedes | 36 | 3:59:16.85 75.690 | 90* |
| 5 | X | Barney Oldfield | 11 | Delage | Delage | Delage | 31 | Flagged | 55* |
| 6 | X | Otto Henning | 17 | Mercer | Mercer | Mercer | 31 | Flagged | 35* |
| 7 | X | Billy Chandler | 12 | Duesenberg | Duesenberg | Duesenberg | 27 | Flagged | 25* |
| 8 | X | W. W. Brown | 3 | DuChesneau | DuChesneau | Brown | 27 | Flagged | 15* |
| 9 | X | Pete Henderson | 5 | Duesenberg | Duesenberg | Duesenberg | 18 | Broken timing gear | |
| 10 | X | Andy Burt | 16 | Stutz | Stutz | Stutz | 13 | Valve sticking | |
| 11 | X | Fred Robillard | 14 | Lozier | Lozier | Lozier | 10 | Disqualified | |
| 12 | X | George Buzane | 18 | DeDietrich | X | X | 1 | Broken crankshaft | |
| -- | -- | Tom Alley | 10 | Ogren | Duesenberg | Duesenberg | -- | DNS, rocker arms | |
| -- | -- | Ralph Mulford | 12 | Duesenberg | Duesenberg | Duesenberg | -- | Driven by B. Chandler | |
| -- | -- | Caleb Bragg | X | Stutz | Stutz | Stutz | -- | Withdrew | |
| -- | -- | George Patrick | X | Mercer | Mercer | Mercer | -- | Withdrew | |
| -- | -- | A. F. Scott | X | Anderson | Tulsa | Stutz | -- | Withdrew |
Known riding mechanics in this race:
| Finish | Start | Driver | Mechanic | Car # | Sponsor/Name | Chassis | Engine | Laps | Status |
| 5 | X | Barney Oldfield | Ray Daschbach | 11 | Delage | Delage | Delage | 31 | Flagged |
| Lap Leaders | Total | Laps |
| Gil Andersen | 24 | 13-36 |
| Earl Cooper | 12 | 1-12 |