| Gretna to Romeoville (Illinois) | 817.18 mi (1,315.13 km) |
| Gretna to Romulus (Michigan) | 928.34 mi (1,494.01 km) |
| Gretna to Ronkonkoma (New York) | 1,211.27 mi (1,949.36 km) |
| Gretna to Roosevelt (New York) | 1,186.49 mi (1,909.47 km) |
| Gretna to Rosamond (California) | 1,672.69 mi (2,691.94 km) |
| Gretna to Rosaryville (Maryland) | 969.66 mi (1,560.52 km) |
| Gretna to Roscoe (Illinois) | 866.67 mi (1,394.77 km) |
| Gretna to Rose Hill (Virginia) | 958.10 mi (1,541.92 km) |
| Gretna to Roseburg (Oregon) | 2,045.81 mi (3,292.42 km) |
| Gretna to Rosedale (California) | 1,731.09 mi (2,785.92 km) |
| Gretna to Rosedale (Maryland) | 1,006.06 mi (1,619.10 km) |
| Gretna to Roselle (Illinois) | 841.16 mi (1,353.71 km) |
| Gretna to Roselle (New Jersey) | 1,156.17 mi (1,860.68 km) |
| Gretna to Roselle Park (New Jersey) | 1,156.38 mi (1,861.02 km) |
| Gretna to Rosemead (California) | 1,662.20 mi (2,675.05 km) |
