| Gaithersburg to Red Bank (New Jersey) | 186.97 mi (300.90 km) |
| Gaithersburg to Red Bank (Tennessee) | 524.61 mi (844.28 km) |
| Gaithersburg to Red Bluff (California) | 2,370.33 mi (3,814.68 km) |
| Gaithersburg to Red Hill (South Carolina) | 383.35 mi (616.94 km) |
| Gaithersburg to Red Oak (Texas) | 1,184.75 mi (1,906.67 km) |
| Gaithersburg to Red Wing (Minnesota) | 875.00 mi (1,408.17 km) |
| Gaithersburg to Redan (Georgia) | 536.57 mi (863.52 km) |
| Gaithersburg to Redding (California) | 2,370.55 mi (3,815.03 km) |
| Gaithersburg to Redland (Maryland) | 3.58 mi (5.75 km) |
| Gaithersburg to Redlands (California) | 2,226.14 mi (3,582.63 km) |
| Gaithersburg to Redmond (Oregon) | 2,268.15 mi (3,650.24 km) |
| Gaithersburg to Redmond (Washington) | 2,295.39 mi (3,694.07 km) |
| Gaithersburg to Redondo Beach (California) | 2,295.41 mi (3,694.10 km) |
| Gaithersburg to Redwood City (California) | 2,417.47 mi (3,890.53 km) |
| Gaithersburg to Reedley (California) | 2,289.56 mi (3,684.68 km) |
