| Port Huron to Castelletto sopra Ticino | 4,243.11 mi (6,828.62 km) |
| Port Huron to Castelli Calepio | 4,297.06 mi (6,915.45 km) |
| Port Huron to Castelnovo ne' Monti | 4,364.29 mi (7,023.64 km) |
| Port Huron to Castelnuovo Berardenga | 4,452.63 mi (7,165.82 km) |
| Port Huron to Castelnuovo di Porto | 4,543.12 mi (7,311.45 km) |
| Port Huron to Castelnuovo di Verona | 4,339.45 mi (6,983.67 km) |
| Port Huron to Castelnuovo Rangone | 4,381.14 mi (7,050.77 km) |
| Port Huron to Castelvetrano | 4,743.66 mi (7,634.18 km) |
| Port Huron to Castelvetro di Modena | 4,383.81 mi (7,055.06 km) |
| Port Huron to Castenaso | 4,404.33 mi (7,088.09 km) |
| Port Huron to Castenedolo | 4,319.26 mi (6,951.17 km) |
| Port Huron to Castiglion Fiorentino | 4,469.60 mi (7,193.13 km) |
| Port Huron to Castiglione del Lago | 4,483.23 mi (7,215.06 km) |
| Port Huron to Castiglione delle Stiviere | 4,330.13 mi (6,968.68 km) |
| Port Huron to Castrolibero | 4,815.70 mi (7,750.12 km) |
