| Boulder to Indianola (Iowa) | 618.71 mi (995.71 km) |
| Boulder to Indio (California) | 745.58 mi (1,199.89 km) |
| Boulder to Inglewood (California) | 834.07 mi (1,342.30 km) |
| Boulder to Inkster (Michigan) | 1,148.64 mi (1,848.55 km) |
| Boulder to Inver Grove Heights (Minnesota) | 703.73 mi (1,132.54 km) |
| Boulder to Inwood (New York) | 1,651.02 mi (2,657.06 km) |
| Boulder to Iona (Florida) | 1,629.36 mi (2,622.19 km) |
| Boulder to Ionia (Michigan) | 1,061.26 mi (1,707.93 km) |
| Boulder to Iowa City (Iowa) | 725.27 mi (1,167.21 km) |
| Boulder to Irmo (South Carolina) | 1,383.10 mi (2,225.89 km) |
| Boulder to Irondale (Alabama) | 1,119.19 mi (1,801.16 km) |
| Boulder to Ironton (Ohio) | 1,208.51 mi (1,944.91 km) |
| Boulder to Irvine (California) | 818.29 mi (1,316.92 km) |
| Boulder to Irving (Texas) | 675.46 mi (1,087.04 km) |
| Boulder to Isabela (Puerto Rico) | 2,711.21 mi (4,363.28 km) |
