| Port Huron to Cortona | 4,475.20 mi (7,202.14 km) |
| Port Huron to Cosenza | 4,818.49 mi (7,754.62 km) |
| Port Huron to Cossato | 4,230.03 mi (6,807.58 km) |
| Port Huron to Costa Volpino | 4,297.32 mi (6,915.87 km) |
| Port Huron to Creazzo | 4,363.94 mi (7,023.09 km) |
| Port Huron to Crema | 4,298.76 mi (6,918.19 km) |
| Port Huron to Cremona | 4,321.92 mi (6,955.46 km) |
| Port Huron to Crevalcore | 4,383.19 mi (7,054.07 km) |
| Port Huron to Crispiano | 4,801.36 mi (7,727.04 km) |
| Port Huron to Crosia | 4,827.97 mi (7,769.86 km) |
| Port Huron to Crotone | 4,863.74 mi (7,827.43 km) |
| Port Huron to Cuneo | 4,250.09 mi (6,839.86 km) |
| Port Huron to Cuorgne | 4,215.83 mi (6,784.73 km) |
| Port Huron to Cusano Milanino | 4,271.60 mi (6,874.47 km) |
| Port Huron to Cutro | 4,860.46 mi (7,822.16 km) |
