| Gaithersburg to Candler-McAfee (Georgia) | 541.52 mi (871.49 km) |
| Gaithersburg to Caño Martin Peña (Puerto Rico) | 1,579.03 mi (2,541.21 km) |
| Gaithersburg to Cañon City (Colorado) | 1,503.10 mi (2,419.01 km) |
| Gaithersburg to Canóvanas (Puerto Rico) | 1,586.77 mi (2,553.65 km) |
| Gaithersburg to Canton (Georgia) | 525.59 mi (845.86 km) |
| Gaithersburg to Canton (Illinois) | 686.95 mi (1,105.53 km) |
| Gaithersburg to Canton (Mississippi) | 846.75 mi (1,362.71 km) |
| Gaithersburg to Canton (Ohio) | 248.47 mi (399.88 km) |
| Gaithersburg to Canyon (Texas) | 1,387.33 mi (2,232.69 km) |
| Gaithersburg to Canyon Lake (California) | 2,240.05 mi (3,605.01 km) |
| Gaithersburg to Canyon Lake (Texas) | 1,353.75 mi (2,178.66 km) |
| Gaithersburg to Cape Coral (Florida) | 906.12 mi (1,458.26 km) |
| Gaithersburg to Cape Girardeau (Missouri) | 681.35 mi (1,096.53 km) |
| Gaithersburg to Carbondale (Illinois) | 656.88 mi (1,057.14 km) |
| Gaithersburg to Carlisle (Pennsylvania) | 73.61 mi (118.47 km) |
