The 2004 Chicagoland 100 was Round 10 of the 2004 Menards IRL Infiniti Pro Series. The event was held at Chicagoland Speedway in Illinois, United States on 11 September 2004. Thiago Medeiros was the race winner.
Chicagoland 100 Race Result
| Pos. | No. | Driver | Chassis | Engine | Tire | Laps | Laps Led | Status | Started | Points |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 11 | Thiago Medeiros | Dallara | Infiniti | Firestone | 67 | 67 | Running | 1 | 52 |
| 2 | 24 | Jeff Simmons | Dallara | Infiniti | Firestone | 67 | 0 | Running | 8 | 40 |
| 3 | 2 | Al Unser III | Dallara | Infiniti | Firestone | 67 | 0 | Running | 5 | 35 |
| 4 | 25 | Arie Luyendyk Jr. | Dallara | Infiniti | Firestone | 67 | 0 | Running | 4 | 32 |
| 5 | 76 | P.J. Chesson | Dallara | Infiniti | Firestone | 67 | 0 | Running | 14 | 30 |
| 6 | 67 | James Chesson | Dallara | Infiniti | Firestone | 67 | 0 | Running | 11 | 28 |
| 7 | 33 | Leonardo Maia | Dallara | Infiniti | Firestone | 67 | 0 | Running | 6 | 26 |
| 8 | 91 | Paul Dana | Dallara | Infiniti | Firestone | 67 | 0 | Running | 3 | 24 |
| 9 | 3 | Jesse Mason | Dallara | Infiniti | Firestone | 67 | 0 | Running | 10 | 22 |
| 10 | 10 | Rolando Quintanilla | Dallara | Infiniti | Firestone | 67 | 0 | Running | 12 | 20 |
| 11 | 21 | Taylor Fletcher | Dallara | Infiniti | Firestone | 67 | 0 | Running | 15 | 19 |
| 12 | 64 | Scott Mayer | Dallara | Infiniti | Firestone | 67 | 0 | Running | 13 | 18 |
| 13 | 5 | Travis Gregg | Dallara | Infiniti | Firestone | 66 | 0 | Running | 2 | 17 |
| 14 | 27 | Gary Peterson | Dallara | Infiniti | Firestone | 66 | 0 | Running | 9 | 16 |
| DNF | 92 | Cory Witherill | Dallara | Infiniti | Firestone | 44 | 0 | Accident | 7 | 15 |