| Gretna to Iselin (New Jersey) | 1,150.42 mi (1,851.43 km) |
| Gretna to Isla Vista (California) | 1,764.59 mi (2,839.83 km) |
| Gretna to Issaquah (Washington) | 2,087.79 mi (3,359.97 km) |
| Gretna to Ithaca (New York) | 1,146.33 mi (1,844.84 km) |
| Gretna to Ives Estates (Florida) | 660.89 mi (1,063.60 km) |
| Gretna to Jackson (Michigan) | 908.05 mi (1,461.37 km) |
| Gretna to Jackson (Mississippi) | 166.48 mi (267.93 km) |
| Gretna to Jackson (Missouri) | 516.57 mi (831.35 km) |
| Gretna to Jackson (Tennessee) | 403.08 mi (648.69 km) |
| Gretna to Jackson (Wyoming) | 1,474.66 mi (2,373.23 km) |
| Gretna to Jacksonville (Alabama) | 368.90 mi (593.69 km) |
| Gretna to Jacksonville (Arkansas) | 364.19 mi (586.11 km) |
| Gretna to Jacksonville (Florida) | 501.35 mi (806.84 km) |
| Gretna to Jacksonville (Illinois) | 678.51 mi (1,091.96 km) |
| Gretna to Jacksonville (North Carolina) | 809.76 mi (1,303.18 km) |
