| Sierpc to Montemor-o-Novo | 1,648.06 mi (2,652.29 km) |
| Sierpc to Montemor-o-Velho | 1,592.59 mi (2,563.03 km) |
| Sierpc to Montijo | 1,672.25 mi (2,691.23 km) |
| Sierpc to Mortagua | 1,562.68 mi (2,514.89 km) |
| Sierpc to Moura | 1,645.28 mi (2,647.82 km) |
| Sierpc to Murtosa | 1,564.22 mi (2,517.37 km) |
| Sierpc to Nazare | 1,634.25 mi (2,630.07 km) |
| Sierpc to Nelas | 1,543.99 mi (2,484.80 km) |
| Sierpc to Obidos | 1,649.33 mi (2,654.34 km) |
| Sierpc to Odemira | 1,717.06 mi (2,763.35 km) |
| Sierpc to Odivelas | 1,677.66 mi (2,699.93 km) |
| Sierpc to Oeiras | 1,688.11 mi (2,716.75 km) |
| Sierpc to Olhao | 1,716.31 mi (2,762.13 km) |
| Sierpc to Oliveira de Azemeis | 1,553.13 mi (2,499.52 km) |
| Sierpc to Oliveira de Frades | 1,547.51 mi (2,490.48 km) |
