| Gaithersburg to Cortona | 4,412.47 mi (7,101.18 km) |
| Gaithersburg to Cosenza | 4,745.67 mi (7,637.41 km) |
| Gaithersburg to Cossato | 4,171.06 mi (6,712.67 km) |
| Gaithersburg to Costa Volpino | 4,245.21 mi (6,832.01 km) |
| Gaithersburg to Creazzo | 4,313.72 mi (6,942.26 km) |
| Gaithersburg to Crema | 4,242.57 mi (6,827.76 km) |
| Gaithersburg to Cremona | 4,265.20 mi (6,864.18 km) |
| Gaithersburg to Crevalcore | 4,326.94 mi (6,963.53 km) |
| Gaithersburg to Crispiano | 4,738.96 mi (7,626.62 km) |
| Gaithersburg to Crosia | 4,758.29 mi (7,657.73 km) |
| Gaithersburg to Crotone | 4,792.51 mi (7,712.80 km) |
| Gaithersburg to Cuneo | 4,181.82 mi (6,729.99 km) |
| Gaithersburg to Cuorgne | 4,154.34 mi (6,685.76 km) |
| Gaithersburg to Cusano Milanino | 4,215.23 mi (6,783.75 km) |
| Gaithersburg to Cutro | 4,788.52 mi (7,706.38 km) |
