| Port Huron to Castelfidardo | 4,530.25 mi (7,290.73 km) |
| Port Huron to Castelfiorentino | 4,420.56 mi (7,114.20 km) |
| Port Huron to Castelfranco di Sopra | 4,443.61 mi (7,151.31 km) |
| Port Huron to Castelfranco di Sotto | 4,407.73 mi (7,093.55 km) |
| Port Huron to Castelfranco Emilia | 4,384.08 mi (7,055.50 km) |
| Port Huron to Castelfranco Veneto | 4,376.41 mi (7,043.14 km) |
| Port Huron to Castellabate | 4,722.39 mi (7,599.95 km) |
| Port Huron to Castellammare del Golfo | 4,732.63 mi (7,616.44 km) |
| Port Huron to Castellammare di Stabia | 4,685.07 mi (7,539.89 km) |
| Port Huron to Castellamonte | 4,218.65 mi (6,789.27 km) |
| Port Huron to Castellana Grotte | 4,786.19 mi (7,702.64 km) |
| Port Huron to Castellaneta | 4,787.76 mi (7,705.16 km) |
| Port Huron to Castellanza | 4,257.65 mi (6,852.03 km) |
| Port Huron to Castellarano | 4,374.44 mi (7,039.99 km) |
| Port Huron to Castelleone | 4,304.64 mi (6,927.64 km) |
