| Rockville to Rosemont (California) | 2,355.81 mi (3,791.31 km) |
| Rockville to Rosemount (Minnesota) | 904.73 mi (1,456.01 km) |
| Rockville to Rosenberg (Texas) | 1,248.84 mi (2,009.82 km) |
| Rockville to Roseville (California) | 2,349.98 mi (3,781.93 km) |
| Rockville to Roseville (Michigan) | 383.80 mi (617.67 km) |
| Rockville to Roseville (Minnesota) | 915.29 mi (1,473.02 km) |
| Rockville to Rossmoor (California) | 2,284.62 mi (3,676.74 km) |
| Rockville to Rossville (Maryland) | 40.95 mi (65.91 km) |
| Rockville to Roswell (Georgia) | 529.73 mi (852.51 km) |
| Rockville to Roswell (New Mexico) | 1,569.32 mi (2,525.57 km) |
| Rockville to Round Lake (Illinois) | 615.57 mi (990.66 km) |
| Rockville to Round Lake Beach (Illinois) | 615.12 mi (989.94 km) |
| Rockville to Round Rock (Texas) | 1,300.91 mi (2,093.61 km) |
| Rockville to Rowland Heights (California) | 2,269.95 mi (3,653.13 km) |
| Rockville to Rowlett (Texas) | 1,161.88 mi (1,869.87 km) |
