| Marinha Grande to Oerlinghausen | 1,189.71 mi (1,914.65 km) |
| Marinha Grande to Oestrich-Winkel | 1,085.90 mi (1,747.58 km) |
| Marinha Grande to Offenburg | 1,027.27 mi (1,653.23 km) |
| Marinha Grande to Oftersheim | 1,084.39 mi (1,745.15 km) |
| Marinha Grande to Ohrdruf | 1,218.03 mi (1,960.23 km) |
| Marinha Grande to Ohringen | 1,114.19 mi (1,793.12 km) |
| Marinha Grande to Olbernhau | 1,312.21 mi (2,111.80 km) |
| Marinha Grande to Olching | 1,158.70 mi (1,864.75 km) |
| Marinha Grande to Oldenburg | 1,227.62 mi (1,975.66 km) |
| Marinha Grande to Oldenburg in Holstein | 1,362.43 mi (2,192.61 km) |
| Marinha Grande to Olfen | 1,136.36 mi (1,828.79 km) |
| Marinha Grande to Olpe | 1,121.12 mi (1,804.26 km) |
| Marinha Grande to Olsberg | 1,157.46 mi (1,862.76 km) |
| Marinha Grande to Oranienburg | 1,378.89 mi (2,219.11 km) |
| Marinha Grande to Ortenberg | 1,138.38 mi (1,832.05 km) |
