| Gretna to Hutchinson (Minnesota) | 1,061.17 mi (1,707.78 km) |
| Gretna to Hutto (Texas) | 449.33 mi (723.13 km) |
| Gretna to Hyattsville (Maryland) | 971.86 mi (1,564.06 km) |
| Gretna to Hybla Valley (Virginia) | 957.69 mi (1,541.25 km) |
| Gretna to Idaho Falls (Idaho) | 1,529.11 mi (2,460.86 km) |
| Gretna to Idylwood (Virginia) | 958.06 mi (1,541.85 km) |
| Gretna to Ilchester (Maryland) | 990.45 mi (1,593.97 km) |
| Gretna to Immokalee (Florida) | 577.74 mi (929.78 km) |
| Gretna to Imperial (California) | 1,515.28 mi (2,438.60 km) |
| Gretna to Imperial Beach (California) | 1,605.14 mi (2,583.23 km) |
| Gretna to Independence (Kentucky) | 698.58 mi (1,124.26 km) |
| Gretna to Independence (Missouri) | 679.44 mi (1,093.45 km) |
| Gretna to Indian Trail (North Carolina) | 653.43 mi (1,051.59 km) |
| Gretna to Indiana (Pennsylvania) | 960.46 mi (1,545.72 km) |
| Gretna to Indianapolis (Indiana) | 716.60 mi (1,153.26 km) |
