| Thornton to Indianola (Iowa) | 4,053.91 mi (6,524.13 km) |
| Thornton to Indio (California) | 5,237.47 mi (8,428.90 km) |
| Thornton to Inglewood (California) | 5,291.16 mi (8,515.30 km) |
| Thornton to Inkster (Michigan) | 3,632.12 mi (5,845.33 km) |
| Thornton to Inver Grove Heights (Minnesota) | 3,865.64 mi (6,221.15 km) |
| Thornton to Inwood (New York) | 3,340.45 mi (5,375.94 km) |
| Thornton to Iona (Florida) | 4,366.09 mi (7,026.55 km) |
| Thornton to Ionia (Michigan) | 3,665.75 mi (5,899.45 km) |
| Thornton to Iowa City (Iowa) | 3,966.07 mi (6,382.77 km) |
| Thornton to Irmo (South Carolina) | 3,946.91 mi (6,351.93 km) |
| Thornton to Irondale (Alabama) | 4,189.41 mi (6,742.20 km) |
| Thornton to Ironton (Ohio) | 3,786.95 mi (6,094.51 km) |
| Thornton to Irvine (California) | 5,289.50 mi (8,512.63 km) |
| Thornton to Irving (Texas) | 4,617.39 mi (7,430.98 km) |
| Thornton to Isabela (Puerto Rico) | 4,185.50 mi (6,735.91 km) |
