| Port Huron to Cocentaina | 4,117.58 mi (6,626.61 km) |
| Port Huron to Coin | 3,996.55 mi (6,431.82 km) |
| Port Huron to Colindres | 3,817.77 mi (6,144.11 km) |
| Port Huron to Collado-Villalba | 3,887.67 mi (6,256.60 km) |
| Port Huron to Colmenar Viejo | 3,897.72 mi (6,272.78 km) |
| Port Huron to Colmenarejo | 3,889.82 mi (6,260.07 km) |
| Port Huron to Conil de la Frontera | 3,948.69 mi (6,354.81 km) |
| Port Huron to Consuegra | 3,947.46 mi (6,352.83 km) |
| Port Huron to Corbera de Llobregat | 4,123.47 mi (6,636.09 km) |
| Port Huron to Cordoba | 3,950.49 mi (6,357.69 km) |
| Port Huron to Coria del Rio | 3,913.12 mi (6,297.56 km) |
| Port Huron to Crevillente | 4,119.50 mi (6,629.70 km) |
| Port Huron to Cuarte de Huerva | 3,992.22 mi (6,424.86 km) |
| Port Huron to Cubellas | 4,119.87 mi (6,630.29 km) |
| Port Huron to Cuellar | 3,847.24 mi (6,191.53 km) |
