| Mason City to Montalegre | 4,147.56 mi (6,674.85 km) |
| Mason City to Montemor-o-Novo | 4,250.12 mi (6,839.91 km) |
| Mason City to Montemor-o-Velho | 4,171.16 mi (6,712.83 km) |
| Mason City to Montijo | 4,218.30 mi (6,788.70 km) |
| Mason City to Mortagua | 4,180.83 mi (6,728.40 km) |
| Mason City to Moura | 4,304.56 mi (6,927.52 km) |
| Mason City to Murtosa | 4,151.91 mi (6,681.86 km) |
| Mason City to Nazare | 4,175.73 mi (6,720.19 km) |
| Mason City to Nelas | 4,194.46 mi (6,750.34 km) |
| Mason City to Obidos | 4,180.90 mi (6,728.51 km) |
| Mason City to Odemira | 4,273.05 mi (6,876.80 km) |
| Mason City to Odivelas | 4,201.66 mi (6,761.93 km) |
| Mason City to Oeiras | 4,199.64 mi (6,758.67 km) |
| Mason City to Olhao | 4,330.78 mi (6,969.71 km) |
| Mason City to Oliveira de Azemeis | 4,154.83 mi (6,686.55 km) |
