| Opelika to Mangualde | 4,198.81 mi (6,757.33 km) |
| Opelika to Marco de Canavezes | 4,166.41 mi (6,705.19 km) |
| Opelika to Marinha Grande | 4,160.17 mi (6,695.15 km) |
| Opelika to Massama | 4,166.00 mi (6,704.53 km) |
| Opelika to Matosinhos | 4,139.35 mi (6,661.65 km) |
| Opelika to Mealhada | 4,169.76 mi (6,710.58 km) |
| Opelika to Melgaco | 4,139.95 mi (6,662.61 km) |
| Opelika to Melres | 4,156.73 mi (6,689.62 km) |
| Opelika to Mira | 4,154.55 mi (6,686.10 km) |
| Opelika to Miranda do Corvo | 4,182.08 mi (6,730.40 km) |
| Opelika to Mirandela | 4,206.97 mi (6,770.47 km) |
| Opelika to Mogadouro | 4,233.19 mi (6,812.67 km) |
| Opelika to Moimenta da Beira | 4,197.42 mi (6,755.10 km) |
| Opelika to Moita | 4,183.29 mi (6,732.36 km) |
| Opelika to Moncao | 4,130.53 mi (6,647.44 km) |
