| Prospect Heights to Indianapolis (Indiana) | 185.69 mi (298.84 km) |
| Prospect Heights to Indianola (Iowa) | 295.14 mi (474.98 km) |
| Prospect Heights to Indio (California) | 1,638.48 mi (2,636.88 km) |
| Prospect Heights to Inglewood (California) | 1,737.67 mi (2,796.51 km) |
| Prospect Heights to Inkster (Michigan) | 236.40 mi (380.44 km) |
| Prospect Heights to Inver Grove Heights (Minnesota) | 318.64 mi (512.80 km) |
| Prospect Heights to Inwood (New York) | 741.35 mi (1,193.09 km) |
| Prospect Heights to Iona (Florida) | 1,128.79 mi (1,816.61 km) |
| Prospect Heights to Ionia (Michigan) | 157.31 mi (253.17 km) |
| Prospect Heights to Iowa City (Iowa) | 187.93 mi (302.45 km) |
| Prospect Heights to Irmo (South Carolina) | 662.53 mi (1,066.24 km) |
| Prospect Heights to Irondale (Alabama) | 595.44 mi (958.27 km) |
| Prospect Heights to Ironton (Ohio) | 370.48 mi (596.23 km) |
| Prospect Heights to Irvine (California) | 1,717.94 mi (2,764.76 km) |
| Prospect Heights to Irving (Texas) | 807.64 mi (1,299.77 km) |
