| Port Huron to Castrovillari | 4,793.74 mi (7,714.78 km) |
| Port Huron to Catania | 4,849.30 mi (7,804.20 km) |
| Port Huron to Catanzaro | 4,850.59 mi (7,806.27 km) |
| Port Huron to Cattolica | 4,476.96 mi (7,204.96 km) |
| Port Huron to Cava de' Tirreni | 4,693.86 mi (7,554.04 km) |
| Port Huron to Cavallino | 4,852.89 mi (7,809.98 km) |
| Port Huron to Cavarzere | 4,403.49 mi (7,086.74 km) |
| Port Huron to Cave | 4,574.07 mi (7,361.25 km) |
| Port Huron to Cavriago | 4,359.09 mi (7,015.28 km) |
| Port Huron to Cavriglia | 4,444.91 mi (7,153.39 km) |
| Port Huron to Cazzago San Martino | 4,304.09 mi (6,926.77 km) |
| Port Huron to Ceccano | 4,600.95 mi (7,404.52 km) |
| Port Huron to Cecina | 4,413.60 mi (7,103.00 km) |
| Port Huron to Cefalu | 4,780.58 mi (7,693.60 km) |
| Port Huron to Ceglie Messapico | 4,809.91 mi (7,740.80 km) |
