| Prudhoe to Mangualde | 1,028.32 mi (1,654.92 km) |
| Prudhoe to Marco de Canavezes | 994.41 mi (1,600.35 km) |
| Prudhoe to Marinha Grande | 1,100.68 mi (1,771.37 km) |
| Prudhoe to Massama | 1,171.69 mi (1,885.66 km) |
| Prudhoe to Matosinhos | 1,001.95 mi (1,612.48 km) |
| Prudhoe to Mealhada | 1,051.85 mi (1,692.80 km) |
| Prudhoe to Melgaco | 933.79 mi (1,502.79 km) |
| Prudhoe to Melres | 1,005.54 mi (1,618.26 km) |
| Prudhoe to Mira | 1,052.34 mi (1,693.58 km) |
| Prudhoe to Miranda do Corvo | 1,069.30 mi (1,720.87 km) |
| Prudhoe to Mirandela | 962.19 mi (1,548.50 km) |
| Prudhoe to Mogadouro | 967.36 mi (1,556.82 km) |
| Prudhoe to Moimenta da Beira | 1,001.30 mi (1,611.43 km) |
| Prudhoe to Moita | 1,174.92 mi (1,890.86 km) |
| Prudhoe to Moncao | 939.72 mi (1,512.33 km) |
