| Marinha Grande to Nuth | 1,051.21 mi (1,691.76 km) |
| Marinha Grande to Oegstgeest | 1,069.71 mi (1,721.54 km) |
| Marinha Grande to Oirschot | 1,060.19 mi (1,706.21 km) |
| Marinha Grande to Oisterwijk | 1,061.17 mi (1,707.79 km) |
| Marinha Grande to Oldebroek | 1,124.61 mi (1,809.89 km) |
| Marinha Grande to Oldenzaal | 1,149.52 mi (1,849.97 km) |
| Marinha Grande to Ommen | 1,143.27 mi (1,839.91 km) |
| Marinha Grande to Oosterend | 1,156.91 mi (1,861.87 km) |
| Marinha Grande to Oosterhout | 1,053.77 mi (1,695.87 km) |
| Marinha Grande to Oosterwolde | 1,162.74 mi (1,871.25 km) |
| Marinha Grande to Oostzaan | 1,094.33 mi (1,761.15 km) |
| Marinha Grande to Opmeer | 1,109.89 mi (1,786.19 km) |
| Marinha Grande to Oss | 1,079.73 mi (1,737.66 km) |
| Marinha Grande to Oud-Beijerland | 1,049.05 mi (1,688.29 km) |
| Marinha Grande to Oudenbosch | 1,041.19 mi (1,675.63 km) |
