| Gaithersburg to Cullman (Alabama) | 633.54 mi (1,019.59 km) |
| Gaithersburg to Culpeper (Virginia) | 62.46 mi (100.53 km) |
| Gaithersburg to Culver City (California) | 2,292.80 mi (3,689.90 km) |
| Gaithersburg to Cumberland (Maryland) | 89.91 mi (144.69 km) |
| Gaithersburg to Cupertino (California) | 2,411.84 mi (3,881.49 km) |
| Gaithersburg to Cutler Bay (Florida) | 954.16 mi (1,535.57 km) |
| Gaithersburg to Cutlerville (Michigan) | 509.79 mi (820.42 km) |
| Gaithersburg to Cuyahoga Falls (Ohio) | 267.19 mi (430.00 km) |
| Gaithersburg to Cypress (California) | 2,278.36 mi (3,666.66 km) |
| Gaithersburg to Cypress Gardens (Florida) | 810.73 mi (1,304.75 km) |
| Gaithersburg to Cypress Lake (Florida) | 911.42 mi (1,466.80 km) |
| Gaithersburg to D'Iberville (Mississippi) | 891.90 mi (1,435.37 km) |
| Gaithersburg to Dakota Ridge (Colorado) | 1,485.58 mi (2,390.81 km) |
| Gaithersburg to Dale City (Virginia) | 34.42 mi (55.39 km) |
| Gaithersburg to Dallas (Georgia) | 555.91 mi (894.64 km) |
