| Gretna to Hormigueros (Puerto Rico) | 1,654.88 mi (2,663.28 km) |
| Gretna to Horn Lake (Mississippi) | 348.31 mi (560.54 km) |
| Gretna to Hot Springs (Arkansas) | 361.66 mi (582.04 km) |
| Gretna to Hot Springs Village (Arkansas) | 369.41 mi (594.51 km) |
| Gretna to Houma (Louisiana) | 45.40 mi (73.07 km) |
| Gretna to Houston (Texas) | 319.92 mi (514.86 km) |
| Gretna to Howard (Wisconsin) | 1,018.55 mi (1,639.20 km) |
| Gretna to Huber Heights (Ohio) | 764.93 mi (1,231.04 km) |
| Gretna to Hudson (Florida) | 456.95 mi (735.39 km) |
| Gretna to Hudson (Ohio) | 919.17 mi (1,479.25 km) |
| Gretna to Hudson (Wisconsin) | 1,050.29 mi (1,690.28 km) |
| Gretna to Hueytown (Alabama) | 301.09 mi (484.56 km) |
| Gretna to Hugo (Minnesota) | 1,065.93 mi (1,715.44 km) |
| Gretna to Humacao (Puerto Rico) | 1,726.01 mi (2,777.74 km) |
| Gretna to Humble (Texas) | 312.17 mi (502.38 km) |
