The 2005 Chicagoland 100 was Round 12 of the 2005 Menards IRL Infiniti Pro Series. The event was held at Chicagoland Speedway in Illinois, United States on 11 September 2005. Jeff Simmons was the race winner.
Chicagoland 100 Race Result
| Pos. | No. | Driver | Chassis | Engine | Tire | Laps | Laps Led | Status | Started | Points |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 24 | Jeff Simmons | Dallara | Infiniti | Firestone | 67 | 25 | Running | 7 | 52 |
| 2 | 4 | Marty Roth | Dallara | Infiniti | Firestone | 67 | 5 | Running | 10 | 40 |
| 3 | 9 | Nick Bussell | Dallara | Infiniti | Firestone | 67 | 20 | Running | 4 | 35 |
| 4 | 6 | Jon Herb | Dallara | Infiniti | Firestone | 67 | 11 | Running | 9 | 32 |
| 5 | 7 | Travis Gregg | Dallara | Infiniti | Firestone | 67 | 0 | Running | 2 | 30 |
| 6 | 1 | Jaime Camara | Dallara | Infiniti | Firestone | 67 | 1 | Running | 6 | 28 |
| DNF | 20 | Jay Drake | Dallara | Infiniti | Firestone | 55 | 0 | Handling | 3 | 26 |
| DNF | 3 | Bobby Wilson | Dallara | Infiniti | Firestone | 6 | 0 | Accident | 11 | 24 |
| DNF | 8 | Sarah McCune | Dallara | Infiniti | Firestone | 5 | 5 | Accident | 1 | 23 |
| DNF | 33 | Wade Cunningham | Dallara | Infiniti | Firestone | 5 | 0 | Accident | 5 | 20 |
| DNF | 19 | Chris Festa | Dallara | Infiniti | Firestone | 5 | 0 | Accident | 8 | 19 |
| DNS | 11 | Scott Mayer | Dallara | Infiniti | Firestone | 0 | 0 | Did not start | 12 | 18 |