| Harlingen to Montemor-o-Novo | 1,194.33 mi (1,922.09 km) |
| Harlingen to Montemor-o-Velho | 1,116.06 mi (1,796.12 km) |
| Harlingen to Montijo | 1,210.17 mi (1,947.59 km) |
| Harlingen to Mortagua | 1,087.95 mi (1,750.88 km) |
| Harlingen to Moura | 1,206.90 mi (1,942.32 km) |
| Harlingen to Murtosa | 1,081.52 mi (1,740.54 km) |
| Harlingen to Nazare | 1,160.06 mi (1,866.94 km) |
| Harlingen to Nelas | 1,072.58 mi (1,726.16 km) |
| Harlingen to Obidos | 1,176.88 mi (1,894.01 km) |
| Harlingen to Odemira | 1,270.05 mi (2,043.95 km) |
| Harlingen to Odivelas | 1,211.26 mi (1,949.33 km) |
| Harlingen to Oeiras | 1,221.36 mi (1,965.59 km) |
| Harlingen to Olhao | 1,285.06 mi (2,068.10 km) |
| Harlingen to Oliveira de Azemeis | 1,070.84 mi (1,723.36 km) |
| Harlingen to Oliveira de Frades | 1,069.91 mi (1,721.85 km) |
