| Gaithersburg to Cividale del Friuli | 4,376.33 mi (7,043.02 km) |
| Gaithersburg to Civita Castellana | 4,465.29 mi (7,186.19 km) |
| Gaithersburg to Civitanova Marche | 4,487.10 mi (7,221.29 km) |
| Gaithersburg to Civitavecchia | 4,445.38 mi (7,154.15 km) |
| Gaithersburg to Civitella in Val di Chiana | 4,395.78 mi (7,074.32 km) |
| Gaithersburg to Clusone | 4,237.16 mi (6,819.05 km) |
| Gaithersburg to Coccaglio | 4,248.77 mi (6,837.74 km) |
| Gaithersburg to Codigoro | 4,364.29 mi (7,023.65 km) |
| Gaithersburg to Codogno | 4,250.24 mi (6,840.10 km) |
| Gaithersburg to Codroipo | 4,362.11 mi (7,020.14 km) |
| Gaithersburg to Cogoleto | 4,229.52 mi (6,806.76 km) |
| Gaithersburg to Colle di Val d'Elsa | 4,370.97 mi (7,034.39 km) |
| Gaithersburg to Colle Salvetti | 4,335.81 mi (6,977.82 km) |
| Gaithersburg to Collecchio | 4,285.73 mi (6,897.22 km) |
| Gaithersburg to Colleferro | 4,512.05 mi (7,261.44 km) |
