| Opelika to Montalegre | 4,169.57 mi (6,710.27 km) |
| Opelika to Montemor-o-Novo | 4,222.12 mi (6,794.85 km) |
| Opelika to Montemor-o-Velho | 4,163.11 mi (6,699.88 km) |
| Opelika to Montijo | 4,186.73 mi (6,737.89 km) |
| Opelika to Mortagua | 4,179.37 mi (6,726.04 km) |
| Opelika to Moura | 4,273.57 mi (6,877.65 km) |
| Opelika to Murtosa | 4,152.72 mi (6,683.16 km) |
| Opelika to Nazare | 4,156.93 mi (6,689.94 km) |
| Opelika to Nelas | 4,196.44 mi (6,753.51 km) |
| Opelika to Obidos | 4,157.93 mi (6,691.54 km) |
| Opelika to Odemira | 4,226.77 mi (6,802.33 km) |
| Opelika to Odivelas | 4,170.04 mi (6,711.03 km) |
| Opelika to Oeiras | 4,165.60 mi (6,703.88 km) |
| Opelika to Olhao | 4,281.24 mi (6,889.98 km) |
| Opelika to Oliveira de Azemeis | 4,158.14 mi (6,691.88 km) |
