| Port Huron to Cascais | 3,705.53 mi (5,963.47 km) |
| Port Huron to Castelo Branco | 3,756.48 mi (6,045.47 km) |
| Port Huron to Castro Daire | 3,700.04 mi (5,954.63 km) |
| Port Huron to Celorico de Basto | 3,681.00 mi (5,923.99 km) |
| Port Huron to Chamusca | 3,726.89 mi (5,997.84 km) |
| Port Huron to Chaves | 3,693.27 mi (5,943.75 km) |
| Port Huron to Cinfaes | 3,684.25 mi (5,929.23 km) |
| Port Huron to Coimbra | 3,700.26 mi (5,955.00 km) |
| Port Huron to Condeixa-a-Nova | 3,700.16 mi (5,954.84 km) |
| Port Huron to Corroios | 3,720.91 mi (5,988.22 km) |
| Port Huron to Coruche | 3,738.31 mi (6,016.23 km) |
| Port Huron to Costa de Caparica | 3,715.91 mi (5,980.18 km) |
| Port Huron to Covilha | 3,740.61 mi (6,019.93 km) |
| Port Huron to Eiras | 3,699.46 mi (5,953.71 km) |
| Port Huron to Elvas | 3,805.49 mi (6,124.35 km) |
