| Gaithersburg to Rosemont (California) | 2,351.98 mi (3,785.14 km) |
| Gaithersburg to Rosemount (Minnesota) | 900.25 mi (1,448.82 km) |
| Gaithersburg to Rosenberg (Texas) | 1,247.63 mi (2,007.87 km) |
| Gaithersburg to Roseville (California) | 2,346.13 mi (3,775.73 km) |
| Gaithersburg to Roseville (Michigan) | 379.16 mi (610.19 km) |
| Gaithersburg to Roseville (Minnesota) | 910.80 mi (1,465.79 km) |
| Gaithersburg to Rossmoor (California) | 2,281.30 mi (3,671.40 km) |
| Gaithersburg to Rossville (Maryland) | 42.30 mi (68.07 km) |
| Gaithersburg to Roswell (Georgia) | 529.56 mi (852.24 km) |
| Gaithersburg to Roswell (New Mexico) | 1,566.61 mi (2,521.22 km) |
| Gaithersburg to Round Lake (Illinois) | 611.27 mi (983.75 km) |
| Gaithersburg to Round Lake Beach (Illinois) | 610.82 mi (983.01 km) |
| Gaithersburg to Round Rock (Texas) | 1,299.27 mi (2,090.97 km) |
| Gaithersburg to Rowland Heights (California) | 2,266.62 mi (3,647.77 km) |
| Gaithersburg to Rowlett (Texas) | 1,159.85 mi (1,866.60 km) |
