| Gaithersburg to Cernavoda | 5,032.06 mi (8,098.32 km) |
| Gaithersburg to Chitila | 4,944.90 mi (7,958.05 km) |
| Gaithersburg to Cisnadie | 4,823.61 mi (7,762.86 km) |
| Gaithersburg to Cluj-Napoca | 4,759.20 mi (7,659.20 km) |
| Gaithersburg to Codlea | 4,874.58 mi (7,844.88 km) |
| Gaithersburg to Comanesti | 4,882.87 mi (7,858.22 km) |
| Gaithersburg to Comarnic | 4,900.43 mi (7,886.49 km) |
| Gaithersburg to Constanta | 5,062.64 mi (8,147.54 km) |
| Gaithersburg to Corabia | 4,916.81 mi (7,912.84 km) |
| Gaithersburg to Costesti | 4,894.86 mi (7,877.51 km) |
| Gaithersburg to Covasna | 4,896.88 mi (7,880.77 km) |
| Gaithersburg to Craiova | 4,866.42 mi (7,831.75 km) |
| Gaithersburg to Cristuru Secuiesc | 4,834.40 mi (7,780.21 km) |
| Gaithersburg to Cugir | 4,787.52 mi (7,704.77 km) |
| Gaithersburg to Cumpana | 5,061.98 mi (8,146.47 km) |
