| Olney to Mangualde | 3,576.56 mi (5,755.91 km) |
| Olney to Marco de Canavezes | 3,542.61 mi (5,701.29 km) |
| Olney to Marinha Grande | 3,542.11 mi (5,700.47 km) |
| Olney to Massama | 3,552.07 mi (5,716.51 km) |
| Olney to Matosinhos | 3,516.06 mi (5,658.56 km) |
| Olney to Mealhada | 3,548.94 mi (5,711.47 km) |
| Olney to Melgaco | 3,513.31 mi (5,654.12 km) |
| Olney to Melres | 3,533.55 mi (5,686.70 km) |
| Olney to Mira | 3,533.84 mi (5,687.17 km) |
| Olney to Miranda do Corvo | 3,562.13 mi (5,732.69 km) |
| Olney to Mirandela | 3,581.35 mi (5,763.63 km) |
| Olney to Mogadouro | 3,607.63 mi (5,805.92 km) |
| Olney to Moimenta da Beira | 3,573.79 mi (5,751.46 km) |
| Olney to Moita | 3,569.43 mi (5,744.44 km) |
| Olney to Moncao | 3,504.19 mi (5,639.45 km) |
