| Gretna to Rockville (Maryland) | 968.24 mi (1,558.23 km) |
| Gretna to Rockville Centre (New York) | 1,183.52 mi (1,904.69 km) |
| Gretna to Rockwall (Texas) | 429.93 mi (691.91 km) |
| Gretna to Rocky Mount (North Carolina) | 823.38 mi (1,325.10 km) |
| Gretna to Rocky Point (New York) | 1,224.49 mi (1,970.63 km) |
| Gretna to Rocky River (Ohio) | 920.70 mi (1,481.73 km) |
| Gretna to Roessleville (New York) | 1,260.51 mi (2,028.60 km) |
| Gretna to Rogers (Arkansas) | 502.16 mi (808.14 km) |
| Gretna to Rogers (Minnesota) | 1,072.74 mi (1,726.41 km) |
| Gretna to Rohnert Park (California) | 1,944.38 mi (3,129.17 km) |
| Gretna to Rolla (Missouri) | 563.77 mi (907.30 km) |
| Gretna to Rolling Meadows (Illinois) | 848.02 mi (1,364.75 km) |
| Gretna to Roma (Texas) | 596.22 mi (959.52 km) |
| Gretna to Rome (Georgia) | 414.25 mi (666.66 km) |
| Gretna to Rome (New York) | 1,220.77 mi (1,964.63 km) |
