| Romeoville to Mangualde | 4,018.19 mi (6,466.65 km) |
| Romeoville to Marco de Canavezes | 3,980.76 mi (6,406.42 km) |
| Romeoville to Marinha Grande | 3,993.87 mi (6,427.52 km) |
| Romeoville to Massama | 4,012.40 mi (6,457.34 km) |
| Romeoville to Matosinhos | 3,955.81 mi (6,366.26 km) |
| Romeoville to Mealhada | 3,994.34 mi (6,428.28 km) |
| Romeoville to Melgaco | 3,944.15 mi (6,347.50 km) |
| Romeoville to Melres | 3,973.37 mi (6,394.52 km) |
| Romeoville to Mira | 3,979.68 mi (6,404.67 km) |
| Romeoville to Miranda do Corvo | 4,009.41 mi (6,452.52 km) |
| Romeoville to Mirandela | 4,014.22 mi (6,460.26 km) |
| Romeoville to Mogadouro | 4,040.35 mi (6,502.32 km) |
| Romeoville to Moimenta da Beira | 4,012.00 mi (6,456.70 km) |
| Romeoville to Moita | 4,029.69 mi (6,485.17 km) |
| Romeoville to Moncao | 3,936.01 mi (6,334.40 km) |
