| Gretna to River Ridge (Louisiana) | 10.66 mi (17.15 km) |
| Gretna to Riverbank (California) | 1,844.10 mi (2,967.79 km) |
| Gretna to Riverdale (Georgia) | 416.55 mi (670.37 km) |
| Gretna to Riverdale (Illinois) | 821.86 mi (1,322.66 km) |
| Gretna to Riverside (California) | 1,622.50 mi (2,611.16 km) |
| Gretna to Riverside (Ohio) | 760.07 mi (1,223.22 km) |
| Gretna to Riverton (Utah) | 1,431.77 mi (2,304.21 km) |
| Gretna to Riverton (Wyoming) | 1,359.72 mi (2,188.26 km) |
| Gretna to Riverview (Florida) | 490.44 mi (789.29 km) |
| Gretna to Riverview (Michigan) | 929.00 mi (1,495.09 km) |
| Gretna to Riviera Beach (Florida) | 643.78 mi (1,036.07 km) |
| Gretna to Riviera Beach (Maryland) | 998.65 mi (1,607.18 km) |
| Gretna to Roanoke (Virginia) | 771.55 mi (1,241.69 km) |
| Gretna to Roanoke Rapids (North Carolina) | 846.42 mi (1,362.18 km) |
| Gretna to Robbinsdale (Minnesota) | 1,059.56 mi (1,705.19 km) |
