| Gaithersburg to Carrollwood (Florida) | 823.50 mi (1,325.29 km) |
| Gaithersburg to Carson (California) | 2,289.47 mi (3,684.54 km) |
| Gaithersburg to Carson City (Nevada) | 2,257.79 mi (3,633.57 km) |
| Gaithersburg to Carteret (New Jersey) | 187.33 mi (301.48 km) |
| Gaithersburg to Cartersville (Georgia) | 542.64 mi (873.30 km) |
| Gaithersburg to Carthage (Missouri) | 938.34 mi (1,510.12 km) |
| Gaithersburg to Cary (Illinois) | 615.63 mi (990.77 km) |
| Gaithersburg to Cary (North Carolina) | 247.83 mi (398.84 km) |
| Gaithersburg to Casa de Oro-Mount Helix (California) | 2,248.36 mi (3,618.38 km) |
| Gaithersburg to Casa Grande (Arizona) | 1,965.57 mi (3,163.27 km) |
| Gaithersburg to Casas Adobes (Arizona) | 1,940.64 mi (3,123.17 km) |
| Gaithersburg to Cascades (Virginia) | 11.16 mi (17.96 km) |
| Gaithersburg to Casper (Wyoming) | 1,531.69 mi (2,465.01 km) |
| Gaithersburg to Casselberry (Florida) | 760.71 mi (1,224.25 km) |
| Gaithersburg to Castaic (California) | 2,293.69 mi (3,691.34 km) |
