| Gaithersburg to Robertsville (New Jersey) | 176.02 mi (283.27 km) |
| Gaithersburg to Robinson (Texas) | 1,238.25 mi (1,992.77 km) |
| Gaithersburg to Robstown (Texas) | 1,410.37 mi (2,269.78 km) |
| Gaithersburg to Rochester (Michigan) | 393.98 mi (634.05 km) |
| Gaithersburg to Rochester (Minnesota) | 856.37 mi (1,378.19 km) |
| Gaithersburg to Rochester (New Hampshire) | 433.11 mi (697.02 km) |
| Gaithersburg to Rochester (New York) | 279.47 mi (449.76 km) |
| Gaithersburg to Rochester Hills (Michigan) | 394.57 mi (635.00 km) |
| Gaithersburg to Rock Hill (South Carolina) | 357.85 mi (575.90 km) |
| Gaithersburg to Rock Island (Illinois) | 721.93 mi (1,161.83 km) |
| Gaithersburg to Rock Springs (Wyoming) | 1,683.89 mi (2,709.96 km) |
| Gaithersburg to Rockford (Illinois) | 656.60 mi (1,056.69 km) |
| Gaithersburg to Rockledge (Florida) | 773.95 mi (1,245.55 km) |
| Gaithersburg to Rocklin (California) | 2,341.79 mi (3,768.75 km) |
| Gaithersburg to Rockport (Texas) | 1,371.84 mi (2,207.76 km) |
