| Niel to Montemor-o-Novo | 1,054.87 mi (1,697.64 km) |
| Niel to Montemor-o-Velho | 980.77 mi (1,578.39 km) |
| Niel to Montijo | 1,072.36 mi (1,725.80 km) |
| Niel to Mortagua | 952.06 mi (1,532.20 km) |
| Niel to Moura | 1,065.01 mi (1,713.97 km) |
| Niel to Murtosa | 947.49 mi (1,524.84 km) |
| Niel to Nazare | 1,024.51 mi (1,648.79 km) |
| Niel to Nelas | 935.85 mi (1,506.11 km) |
| Niel to Obidos | 1,041.04 mi (1,675.39 km) |
| Niel to Odemira | 1,129.83 mi (1,818.29 km) |
| Niel to Odivelas | 1,074.32 mi (1,728.95 km) |
| Niel to Oeiras | 1,084.55 mi (1,745.41 km) |
| Niel to Olhao | 1,142.53 mi (1,838.73 km) |
| Niel to Oliveira de Azemeis | 936.64 mi (1,507.37 km) |
| Niel to Oliveira de Frades | 934.56 mi (1,504.03 km) |
