| Olean to Montalegre | 3,519.01 mi (5,663.31 km) |
| Olean to Montemor-o-Novo | 3,597.32 mi (5,789.32 km) |
| Olean to Montemor-o-Velho | 3,527.44 mi (5,676.87 km) |
| Olean to Montijo | 3,563.57 mi (5,735.02 km) |
| Olean to Mortagua | 3,540.47 mi (5,697.84 km) |
| Olean to Moura | 3,650.74 mi (5,875.29 km) |
| Olean to Murtosa | 3,512.48 mi (5,652.79 km) |
| Olean to Nazare | 3,526.79 mi (5,675.81 km) |
| Olean to Nelas | 3,555.94 mi (5,722.73 km) |
| Olean to Obidos | 3,529.98 mi (5,680.96 km) |
| Olean to Odemira | 3,611.90 mi (5,812.80 km) |
| Olean to Odivelas | 3,546.79 mi (5,708.00 km) |
| Olean to Oeiras | 3,543.61 mi (5,702.89 km) |
| Olean to Olhao | 3,668.57 mi (5,903.99 km) |
| Olean to Oliveira de Azemeis | 3,516.68 mi (5,659.55 km) |
