| Rockville to Rockport (Texas) | 1,372.92 mi (2,209.50 km) |
| Rockville to Rockville Centre (New York) | 216.10 mi (347.78 km) |
| Rockville to Rockwall (Texas) | 1,156.08 mi (1,860.53 km) |
| Rockville to Rocky Mount (North Carolina) | 218.13 mi (351.05 km) |
| Rockville to Rocky Point (New York) | 257.30 mi (414.09 km) |
| Rockville to Rocky River (Ohio) | 297.43 mi (478.66 km) |
| Rockville to Roessleville (New York) | 305.09 mi (490.99 km) |
| Rockville to Rogers (Arkansas) | 947.19 mi (1,524.36 km) |
| Rockville to Rogers (Minnesota) | 938.82 mi (1,510.89 km) |
| Rockville to Rohnert Park (California) | 2,429.44 mi (3,909.81 km) |
| Rockville to Rolla (Missouri) | 792.63 mi (1,275.62 km) |
| Rockville to Rolling Meadows (Illinois) | 606.17 mi (975.54 km) |
| Rockville to Roma (Texas) | 1,535.47 mi (2,471.11 km) |
| Rockville to Rome (Georgia) | 555.35 mi (893.75 km) |
| Rockville to Rome (New York) | 299.02 mi (481.22 km) |
