| Gretna to Indianola (Iowa) | 815.33 mi (1,312.15 km) |
| Gretna to Indio (California) | 1,555.37 mi (2,503.12 km) |
| Gretna to Inglewood (California) | 1,676.93 mi (2,698.77 km) |
| Gretna to Inkster (Michigan) | 933.82 mi (1,502.83 km) |
| Gretna to Inver Grove Heights (Minnesota) | 1,043.45 mi (1,679.27 km) |
| Gretna to Inwood (New York) | 1,177.00 mi (1,894.20 km) |
| Gretna to Iona (Florida) | 545.41 mi (877.75 km) |
| Gretna to Ionia (Michigan) | 943.84 mi (1,518.96 km) |
| Gretna to Iowa City (Iowa) | 815.74 mi (1,312.81 km) |
| Gretna to Irmo (South Carolina) | 593.88 mi (955.76 km) |
| Gretna to Irondale (Alabama) | 320.49 mi (515.79 km) |
| Gretna to Ironton (Ohio) | 729.03 mi (1,173.26 km) |
| Gretna to Irvine (California) | 1,643.64 mi (2,645.19 km) |
| Gretna to Irving (Texas) | 455.97 mi (733.80 km) |
| Gretna to Isabela (Puerto Rico) | 1,646.76 mi (2,650.20 km) |
