| Helena to Cividale del Friuli | 5,229.80 mi (8,416.54 km) |
| Helena to Civita Castellana | 5,414.97 mi (8,714.54 km) |
| Helena to Civitanova Marche | 5,396.71 mi (8,685.16 km) |
| Helena to Civitavecchia | 5,407.86 mi (8,703.11 km) |
| Helena to Civitella in Val di Chiana | 5,331.57 mi (8,580.34 km) |
| Helena to Clusone | 5,142.96 mi (8,276.80 km) |
| Helena to Coccaglio | 5,161.40 mi (8,306.47 km) |
| Helena to Codigoro | 5,263.87 mi (8,471.39 km) |
| Helena to Codogno | 5,175.57 mi (8,329.27 km) |
| Helena to Codroipo | 5,224.92 mi (8,408.69 km) |
| Helena to Cogoleto | 5,186.21 mi (8,346.40 km) |
| Helena to Colle di Val d'Elsa | 5,315.28 mi (8,554.11 km) |
| Helena to Colle Salvetti | 5,284.83 mi (8,505.11 km) |
| Helena to Collecchio | 5,213.25 mi (8,389.92 km) |
| Helena to Colleferro | 5,464.69 mi (8,794.57 km) |
