| Festus to Indianola (Iowa) | 274.25 mi (441.37 km) |
| Festus to Indio (California) | 1,471.74 mi (2,368.53 km) |
| Festus to Inglewood (California) | 1,581.04 mi (2,544.44 km) |
| Festus to Inkster (Michigan) | 467.90 mi (753.02 km) |
| Festus to Inver Grove Heights (Minnesota) | 476.45 mi (766.77 km) |
| Festus to Inwood (New York) | 903.10 mi (1,453.40 km) |
| Festus to Iona (Florida) | 946.06 mi (1,522.54 km) |
| Festus to Ionia (Michigan) | 431.62 mi (694.62 km) |
| Festus to Iowa City (Iowa) | 244.74 mi (393.87 km) |
| Festus to Irmo (South Carolina) | 587.06 mi (944.78 km) |
| Festus to Irondale (Alabama) | 385.15 mi (619.84 km) |
| Festus to Ironton (Ohio) | 419.23 mi (674.69 km) |
| Festus to Irvine (California) | 1,556.44 mi (2,504.84 km) |
| Festus to Irving (Texas) | 522.45 mi (840.81 km) |
| Festus to Isabela (Puerto Rico) | 1,958.18 mi (3,151.38 km) |
