| Gretna to Hanahan (South Carolina) | 627.84 mi (1,010.40 km) |
| Gretna to Hanford (California) | 1,761.96 mi (2,835.60 km) |
| Gretna to Hannibal (Missouri) | 681.34 mi (1,096.51 km) |
| Gretna to Hanover (Pennsylvania) | 1,006.38 mi (1,619.61 km) |
| Gretna to Hanover Park (Illinois) | 840.80 mi (1,353.14 km) |
| Gretna to Happy Valley (Oregon) | 2,053.11 mi (3,304.16 km) |
| Gretna to Harker Heights (Texas) | 458.91 mi (738.54 km) |
| Gretna to Harlingen (Texas) | 532.15 mi (856.40 km) |
| Gretna to Harper Woods (Michigan) | 951.55 mi (1,531.38 km) |
| Gretna to Harrisburg (North Carolina) | 661.92 mi (1,065.25 km) |
| Gretna to Harrisburg (Pennsylvania) | 1,030.75 mi (1,658.82 km) |
| Gretna to Harrison (Arkansas) | 472.22 mi (759.96 km) |
| Gretna to Harrison (New Jersey) | 1,164.34 mi (1,873.82 km) |
| Gretna to Harrison (New York) | 1,194.01 mi (1,921.58 km) |
| Gretna to Harrison (Ohio) | 711.60 mi (1,145.21 km) |
