| Gretna to Hilliard (Ohio) | 800.44 mi (1,288.19 km) |
| Gretna to Hillsboro (Oregon) | 2,074.75 mi (3,338.99 km) |
| Gretna to Hillsborough (California) | 1,919.52 mi (3,089.16 km) |
| Gretna to Hillsborough (New Jersey) | 1,133.54 mi (1,824.25 km) |
| Gretna to Hilo (Hawaii) | 4,088.41 mi (6,579.66 km) |
| Gretna to Hilton Head Island (South Carolina) | 572.45 mi (921.27 km) |
| Gretna to Hinesville (Georgia) | 517.45 mi (832.75 km) |
| Gretna to Hinsdale (Illinois) | 830.05 mi (1,335.83 km) |
| Gretna to Hobart (Indiana) | 816.63 mi (1,314.25 km) |
| Gretna to Hobbs (New Mexico) | 797.25 mi (1,283.05 km) |
| Gretna to Hobe Sound (Florida) | 632.58 mi (1,018.04 km) |
| Gretna to Hoboken (New Jersey) | 1,169.79 mi (1,882.59 km) |
| Gretna to Hockessin (Delaware) | 1,060.27 mi (1,706.33 km) |
| Gretna to Hoffman Estates (Illinois) | 846.41 mi (1,362.17 km) |
| Gretna to Holbrook (New York) | 1,213.32 mi (1,952.65 km) |
