| Alpena to Montalegre | 3,658.18 mi (5,887.27 km) |
| Alpena to Montemor-o-Novo | 3,755.06 mi (6,043.18 km) |
| Alpena to Montemor-o-Velho | 3,678.03 mi (5,919.22 km) |
| Alpena to Montijo | 3,722.79 mi (5,991.26 km) |
| Alpena to Mortagua | 3,688.52 mi (5,936.09 km) |
| Alpena to Moura | 3,809.33 mi (6,130.53 km) |
| Alpena to Murtosa | 3,659.78 mi (5,889.85 km) |
| Alpena to Nazare | 3,681.42 mi (5,924.68 km) |
| Alpena to Nelas | 3,702.61 mi (5,958.78 km) |
| Alpena to Obidos | 3,686.16 mi (5,932.31 km) |
| Alpena to Odemira | 3,776.30 mi (6,077.38 km) |
| Alpena to Odivelas | 3,706.11 mi (5,964.41 km) |
| Alpena to Oeiras | 3,703.84 mi (5,960.76 km) |
| Alpena to Olhao | 3,833.88 mi (6,170.04 km) |
| Alpena to Oliveira de Azemeis | 3,663.01 mi (5,895.05 km) |
