| Piqua to Mangualde | 3,887.82 mi (6,256.83 km) |
| Piqua to Marco de Canavezes | 3,851.83 mi (6,198.92 km) |
| Piqua to Marinha Grande | 3,859.02 mi (6,210.50 km) |
| Piqua to Massama | 3,873.81 mi (6,234.30 km) |
| Piqua to Matosinhos | 3,826.13 mi (6,157.56 km) |
| Piqua to Mealhada | 3,862.28 mi (6,215.74 km) |
| Piqua to Melgaco | 3,818.30 mi (6,144.95 km) |
| Piqua to Melres | 3,843.69 mi (6,185.83 km) |
| Piqua to Mira | 3,847.39 mi (6,191.78 km) |
| Piqua to Miranda do Corvo | 3,876.55 mi (6,238.71 km) |
| Piqua to Mirandela | 3,887.64 mi (6,256.55 km) |
| Piqua to Mogadouro | 3,913.89 mi (6,298.79 km) |
| Piqua to Moimenta da Beira | 3,883.10 mi (6,249.25 km) |
| Piqua to Moita | 3,891.16 mi (6,262.22 km) |
| Piqua to Moncao | 3,809.71 mi (6,131.14 km) |
