| Sioux City to Mangualde | 4,357.04 mi (7,011.98 km) |
| Sioux City to Marco de Canavezes | 4,317.82 mi (6,948.86 km) |
| Sioux City to Marinha Grande | 4,338.96 mi (6,982.89 km) |
| Sioux City to Massama | 4,362.46 mi (7,020.69 km) |
| Sioux City to Matosinhos | 4,294.02 mi (6,910.56 km) |
| Sioux City to Mealhada | 4,335.64 mi (6,977.53 km) |
| Sioux City to Melgaco | 4,277.13 mi (6,883.38 km) |
| Sioux City to Melres | 4,311.48 mi (6,938.66 km) |
| Sioux City to Mira | 4,321.34 mi (6,954.53 km) |
| Sioux City to Miranda do Corvo | 4,351.71 mi (7,003.40 km) |
| Sioux City to Mirandela | 4,347.83 mi (6,997.16 km) |
| Sioux City to Mogadouro | 4,373.66 mi (7,038.73 km) |
| Sioux City to Moimenta da Beira | 4,348.85 mi (6,998.79 km) |
| Sioux City to Moita | 4,379.59 mi (7,048.27 km) |
| Sioux City to Moncao | 4,269.64 mi (6,871.32 km) |
