| Port Neches to Montalegre | 4,690.36 mi (7,548.41 km) |
| Port Neches to Montemor-o-Novo | 4,750.16 mi (7,644.65 km) |
| Port Neches to Montemor-o-Velho | 4,688.35 mi (7,545.16 km) |
| Port Neches to Montijo | 4,715.10 mi (7,588.21 km) |
| Port Neches to Mortagua | 4,703.74 mi (7,569.94 km) |
| Port Neches to Moura | 4,802.14 mi (7,728.29 km) |
| Port Neches to Murtosa | 4,676.67 mi (7,526.37 km) |
| Port Neches to Nazare | 4,683.59 mi (7,537.52 km) |
| Port Neches to Nelas | 4,720.38 mi (7,596.71 km) |
| Port Neches to Obidos | 4,685.13 mi (7,539.99 km) |
| Port Neches to Odemira | 4,756.96 mi (7,655.59 km) |
| Port Neches to Odivelas | 4,698.36 mi (7,561.28 km) |
| Port Neches to Oeiras | 4,694.20 mi (7,554.58 km) |
| Port Neches to Olhao | 4,811.93 mi (7,744.06 km) |
| Port Neches to Oliveira de Azemeis | 4,681.75 mi (7,534.54 km) |
