| Clayton to Montalegre | 870.85 mi (1,401.49 km) |
| Clayton to Montemor-o-Novo | 1,088.32 mi (1,751.48 km) |
| Clayton to Montemor-o-Velho | 993.78 mi (1,599.33 km) |
| Clayton to Montijo | 1,095.49 mi (1,763.02 km) |
| Clayton to Mortagua | 969.48 mi (1,560.23 km) |
| Clayton to Moura | 1,113.72 mi (1,792.36 km) |
| Clayton to Murtosa | 955.54 mi (1,537.79 km) |
| Clayton to Nazare | 1,037.11 mi (1,669.07 km) |
| Clayton to Nelas | 958.57 mi (1,542.67 km) |
| Clayton to Obidos | 1,054.52 mi (1,697.08 km) |
| Clayton to Odemira | 1,165.31 mi (1,875.39 km) |
| Clayton to Odivelas | 1,092.48 mi (1,758.18 km) |
| Clayton to Oeiras | 1,101.64 mi (1,772.92 km) |
| Clayton to Olhao | 1,193.02 mi (1,919.97 km) |
| Clayton to Oliveira de Azemeis | 946.07 mi (1,522.55 km) |
