| Port Huron to Montalegre | 3,676.04 mi (5,916.02 km) |
| Port Huron to Montemor-o-Novo | 3,763.37 mi (6,056.56 km) |
| Port Huron to Montemor-o-Velho | 3,690.02 mi (5,938.52 km) |
| Port Huron to Montijo | 3,730.29 mi (6,003.32 km) |
| Port Huron to Mortagua | 3,701.84 mi (5,957.54 km) |
| Port Huron to Moura | 3,817.25 mi (6,143.26 km) |
| Port Huron to Murtosa | 3,673.46 mi (5,911.87 km) |
| Port Huron to Nazare | 3,691.30 mi (5,940.57 km) |
| Port Huron to Nelas | 3,716.66 mi (5,981.39 km) |
| Port Huron to Obidos | 3,695.23 mi (5,946.90 km) |
| Port Huron to Odemira | 3,781.09 mi (6,085.07 km) |
| Port Huron to Odivelas | 3,713.53 mi (5,976.35 km) |
| Port Huron to Oeiras | 3,710.78 mi (5,971.93 km) |
| Port Huron to Olhao | 3,838.23 mi (6,177.03 km) |
| Port Huron to Oliveira de Azemeis | 3,677.20 mi (5,917.89 km) |
