| Port Huron to Cividale del Friuli | 4,417.65 mi (7,109.52 km) |
| Port Huron to Civita Castellana | 4,532.69 mi (7,294.66 km) |
| Port Huron to Civitanova Marche | 4,544.58 mi (7,313.80 km) |
| Port Huron to Civitavecchia | 4,515.76 mi (7,267.42 km) |
| Port Huron to Civitella in Val di Chiana | 4,458.44 mi (7,175.16 km) |
| Port Huron to Clusone | 4,289.34 mi (6,903.02 km) |
| Port Huron to Coccaglio | 4,302.91 mi (6,924.87 km) |
| Port Huron to Codigoro | 4,417.11 mi (7,108.66 km) |
| Port Huron to Codogno | 4,307.69 mi (6,932.55 km) |
| Port Huron to Codroipo | 4,405.54 mi (7,090.03 km) |
| Port Huron to Cogoleto | 4,294.76 mi (6,911.75 km) |
| Port Huron to Colle di Val d'Elsa | 4,435.41 mi (7,138.10 km) |
| Port Huron to Colle Salvetti | 4,400.88 mi (7,082.52 km) |
| Port Huron to Collecchio | 4,344.37 mi (6,991.58 km) |
| Port Huron to Colleferro | 4,580.98 mi (7,372.37 km) |
