| Port Huron to Carmona | 3,925.94 mi (6,318.19 km) |
| Port Huron to Cartagena | 4,136.07 mi (6,656.37 km) |
| Port Huron to Cartama | 4,000.48 mi (6,438.14 km) |
| Port Huron to Cartaya | 3,861.54 mi (6,214.54 km) |
| Port Huron to Caspe | 4,043.89 mi (6,508.01 km) |
| Port Huron to Cassa de la Selva | 4,146.90 mi (6,673.80 km) |
| Port Huron to Castalla | 4,112.71 mi (6,618.77 km) |
| Port Huron to Castellbisbal | 4,123.47 mi (6,636.09 km) |
| Port Huron to Castelldefels | 4,130.54 mi (6,647.46 km) |
| Port Huron to Castello de Ampurias | 4,141.82 mi (6,665.62 km) |
| Port Huron to Castellon de la Plana | 4,089.78 mi (6,581.87 km) |
| Port Huron to Castilleja de la Cuesta | 3,909.50 mi (6,291.73 km) |
| Port Huron to Catarroja | 4,094.66 mi (6,589.72 km) |
| Port Huron to Catral | 4,123.04 mi (6,635.38 km) |
| Port Huron to Caudete | 4,094.29 mi (6,589.12 km) |
