| Port Huron to Collegno | 4,224.53 mi (6,798.72 km) |
| Port Huron to Cologno al Serio | 4,291.01 mi (6,905.72 km) |
| Port Huron to Cologno Monzese | 4,276.24 mi (6,881.94 km) |
| Port Huron to Colorno | 4,343.84 mi (6,990.73 km) |
| Port Huron to Comacchio | 4,425.15 mi (7,121.58 km) |
| Port Huron to Comiso | 4,852.69 mi (7,809.65 km) |
| Port Huron to Como | 4,257.68 mi (6,852.07 km) |
| Port Huron to Concordia Sagittaria | 4,408.39 mi (7,094.62 km) |
| Port Huron to Concorezzo | 4,276.19 mi (6,881.86 km) |
| Port Huron to Conegliano | 4,381.92 mi (7,052.02 km) |
| Port Huron to Conselice | 4,418.58 mi (7,111.01 km) |
| Port Huron to Conselve | 4,391.10 mi (7,066.80 km) |
| Port Huron to Conversano | 4,780.51 mi (7,693.49 km) |
| Port Huron to Copertino | 4,849.08 mi (7,803.84 km) |
| Port Huron to Copparo | 4,403.15 mi (7,086.18 km) |
