| Owings Mills to Montalegre | 3,521.84 mi (5,667.85 km) |
| Owings Mills to Montemor-o-Novo | 3,586.45 mi (5,771.83 km) |
| Owings Mills to Montemor-o-Velho | 3,522.10 mi (5,668.27 km) |
| Owings Mills to Montijo | 3,551.79 mi (5,716.06 km) |
| Owings Mills to Mortagua | 3,536.88 mi (5,692.06 km) |
| Owings Mills to Moura | 3,638.97 mi (5,856.36 km) |
| Owings Mills to Murtosa | 3,509.57 mi (5,648.11 km) |
| Owings Mills to Nazare | 3,518.53 mi (5,662.53 km) |
| Owings Mills to Nelas | 3,553.25 mi (5,718.40 km) |
| Owings Mills to Obidos | 3,520.59 mi (5,665.84 km) |
| Owings Mills to Odemira | 3,596.08 mi (5,787.34 km) |
| Owings Mills to Odivelas | 3,535.02 mi (5,689.07 km) |
| Owings Mills to Oeiras | 3,531.20 mi (5,682.91 km) |
| Owings Mills to Olhao | 3,651.79 mi (5,876.99 km) |
| Owings Mills to Oliveira de Azemeis | 3,514.44 mi (5,655.95 km) |
