| Rockville to Roy (Utah) | 1,836.68 mi (2,955.85 km) |
| Rockville to Royal Kunia (Hawaii) | 4,825.31 mi (7,765.58 km) |
| Rockville to Royal Oak (Michigan) | 392.83 mi (632.20 km) |
| Rockville to Royal Palm Beach (Florida) | 873.52 mi (1,405.79 km) |
| Rockville to Royse City (Texas) | 1,148.02 mi (1,847.57 km) |
| Rockville to Ruskin (Florida) | 842.29 mi (1,355.53 km) |
| Rockville to Russellville (Alabama) | 664.40 mi (1,069.25 km) |
| Rockville to Russellville (Arkansas) | 916.91 mi (1,475.63 km) |
| Rockville to Ruston (Louisiana) | 976.55 mi (1,571.60 km) |
| Rockville to Rutherford (New Jersey) | 201.20 mi (323.81 km) |
| Rockville to Rutland (Vermont) | 380.31 mi (612.05 km) |
| Rockville to Sabana Grande (Puerto Rico) | 1,574.56 mi (2,534.01 km) |
| Rockville to Sachse (Texas) | 1,161.67 mi (1,869.52 km) |
| Rockville to Saco (Maine) | 463.86 mi (746.51 km) |
| Rockville to Sacramento (California) | 2,361.36 mi (3,800.24 km) |
