| Gretna to Robertsville (New Jersey) | 1,142.42 mi (1,838.54 km) |
| Gretna to Robinson (Texas) | 433.21 mi (697.18 km) |
| Gretna to Robstown (Texas) | 483.50 mi (778.13 km) |
| Gretna to Rochester (Michigan) | 962.60 mi (1,549.15 km) |
| Gretna to Rochester (Minnesota) | 983.62 mi (1,582.98 km) |
| Gretna to Rochester (New Hampshire) | 1,399.16 mi (2,251.73 km) |
| Gretna to Rochester (New York) | 1,144.27 mi (1,841.52 km) |
| Gretna to Rochester Hills (Michigan) | 960.42 mi (1,545.64 km) |
| Gretna to Rock Hill (South Carolina) | 630.46 mi (1,014.62 km) |
| Gretna to Rock Island (Illinois) | 799.26 mi (1,286.28 km) |
| Gretna to Rock Springs (Wyoming) | 1,339.09 mi (2,155.06 km) |
| Gretna to Rockford (Illinois) | 855.03 mi (1,376.04 km) |
| Gretna to Rockledge (Florida) | 572.76 mi (921.77 km) |
| Gretna to Rocklin (California) | 1,871.79 mi (3,012.36 km) |
| Gretna to Rockport (Texas) | 443.75 mi (714.15 km) |
