| Gaithersburg to Cadillac (Michigan) | 550.89 mi (886.57 km) |
| Gaithersburg to Caguas (Puerto Rico) | 1,592.02 mi (2,562.11 km) |
| Gaithersburg to Cahokia (Illinois) | 698.22 mi (1,123.67 km) |
| Gaithersburg to Calabasas (California) | 2,304.08 mi (3,708.06 km) |
| Gaithersburg to Caldwell (Idaho) | 2,048.71 mi (3,297.08 km) |
| Gaithersburg to Caledonia (Wisconsin) | 610.61 mi (982.68 km) |
| Gaithersburg to Calera (Alabama) | 674.11 mi (1,084.88 km) |
| Gaithersburg to Calexico (California) | 2,171.46 mi (3,494.63 km) |
| Gaithersburg to Calhoun (Georgia) | 534.04 mi (859.45 km) |
| Gaithersburg to California (Maryland) | 69.64 mi (112.07 km) |
| Gaithersburg to California City (California) | 2,237.30 mi (3,600.59 km) |
| Gaithersburg to Callaway (Florida) | 781.28 mi (1,257.35 km) |
| Gaithersburg to Calumet City (Illinois) | 570.03 mi (917.37 km) |
| Gaithersburg to Calverton (Maryland) | 15.13 mi (24.35 km) |
| Gaithersburg to Camano (Washington) | 2,310.72 mi (3,718.74 km) |
