500 Cc Classification
| Pos | Rider | Manufacturer | Laps | Time | Grid | Points |
|---|---|---|---|---|---|---|
| 1 | Wayne Rainey | Yamaha | 35 | 51:19.361 | 1 | 20 |
| 2 | Mick Doohan | Honda | 35 | +6.974 | 4 | 17 |
| 3 | Kevin Schwantz | Suzuki | 35 | +16.603 | 3 | 15 |
| 4 | Jean-Philippe Ruggia | Yamaha | 35 | +19.931 | 10 | 13 |
| 5 | Eddie Lawson | Cagiva | 35 | +21.851 | 5 | 11 |
| 6 | Alex Barros | Cagiva | 35 | +25.091 | 7 | 10 |
| 7 | Wayne Gardner | Honda | 35 | +35.069 | 6 | 9 |
| 8 | Juan Garriga | Yamaha | 35 | +43.188 | 9 | 8 |
| 9 | Adrien Morillas | Yamaha | 35 | +53.613 | 8 | 7 |
| 10 | Didier de Radiguès | Suzuki | 35 | +1:03.059 | 13 | 6 |
| 11 | Rich Oliver | Yamaha | 34 | +1 lap | 14 | 5 |
| 12 | Robbie Petersen | Yamaha | 34 | +1 lap | 15 | 4 |
| 13 | Eddie Laycock | Yamaha | 34 | +1 lap | 3 | |
| 14 | Cees Doorakkers | Honda | 32 | +3 laps | 2 | |
| 15 | Niggi Schmassman | Honda | 31 | +4 laps | 1 | |
| Ret | Doug Chandler | Yamaha | 22 | Retired | 11 | |
| Ret | Sito Pons | Honda | 10 | Retired | 12 | |
| Ret | John Kocinski | Yamaha | 6 | Retired | 2 | |
Read more about this topic: 1991 United States Motorcycle Grand Prix