| Gretna to Roy (Utah) | 1,454.63 mi (2,340.99 km) |
| Gretna to Royal Kunia (Hawaii) | 4,215.84 mi (6,784.73 km) |
| Gretna to Royal Oak (Michigan) | 950.76 mi (1,530.10 km) |
| Gretna to Royal Palm Beach (Florida) | 637.25 mi (1,025.55 km) |
| Gretna to Royse City (Texas) | 425.68 mi (685.07 km) |
| Gretna to Ruskin (Florida) | 486.29 mi (782.61 km) |
| Gretna to Russellville (Alabama) | 345.31 mi (555.72 km) |
| Gretna to Russellville (Arkansas) | 411.94 mi (662.96 km) |
| Gretna to Ruston (Louisiana) | 236.97 mi (381.36 km) |
| Gretna to Rutherford (New Jersey) | 1,169.43 mi (1,882.02 km) |
| Gretna to Rutland (Vermont) | 1,332.39 mi (2,144.27 km) |
| Gretna to Sabana Grande (Puerto Rico) | 1,665.69 mi (2,680.67 km) |
| Gretna to Sachse (Texas) | 439.01 mi (706.52 km) |
| Gretna to Saco (Maine) | 1,429.90 mi (2,301.20 km) |
| Gretna to Sacramento (California) | 1,880.80 mi (3,026.86 km) |
