| Gretna to Ridgeland (Mississippi) | 173.76 mi (279.64 km) |
| Gretna to Ridgewood (New Jersey) | 1,175.60 mi (1,891.94 km) |
| Gretna to Rifle (Colorado) | 1,202.78 mi (1,935.69 km) |
| Gretna to Rincon (Georgia) | 546.77 mi (879.94 km) |
| Gretna to Ringwood (New Jersey) | 1,173.79 mi (1,889.04 km) |
| Gretna to Río Grande (Puerto Rico) | 1,716.59 mi (2,762.58 km) |
| Gretna to Rio Grande City (Texas) | 587.06 mi (944.79 km) |
| Gretna to Rio Linda (California) | 1,880.68 mi (3,026.67 km) |
| Gretna to Rio Rancho (New Mexico) | 1,036.10 mi (1,667.44 km) |
| Gretna to Rio Rico (Arizona) | 1,246.75 mi (2,006.45 km) |
| Gretna to Ripon (California) | 1,854.41 mi (2,984.38 km) |
| Gretna to River Edge (New Jersey) | 1,176.54 mi (1,893.45 km) |
| Gretna to River Falls (Wisconsin) | 1,042.46 mi (1,677.68 km) |
| Gretna to River Forest (Illinois) | 837.36 mi (1,347.60 km) |
| Gretna to River Grove (Illinois) | 839.20 mi (1,350.57 km) |
