| Porvoo to Opwijk | 1,052.23 mi (1,693.41 km) |
| Porvoo to Ostend | 1,077.82 mi (1,734.58 km) |
| Porvoo to Oud-Heverlee | 1,044.56 mi (1,681.05 km) |
| Porvoo to Oud-Turnhout | 1,010.80 mi (1,626.73 km) |
| Porvoo to Oudenaarde | 1,075.61 mi (1,731.02 km) |
| Porvoo to Oudenburg | 1,077.41 mi (1,733.92 km) |
| Porvoo to Oupeye | 1,022.35 mi (1,645.32 km) |
| Porvoo to Overijse | 1,051.05 mi (1,691.50 km) |
| Porvoo to Overpelt | 1,002.97 mi (1,614.12 km) |
| Porvoo to Paal | 1,019.15 mi (1,640.16 km) |
| Porvoo to Peer | 1,006.13 mi (1,619.21 km) |
| Porvoo to Pepinster | 1,024.70 mi (1,649.10 km) |
| Porvoo to Peruwelz | 1,092.86 mi (1,758.78 km) |
| Porvoo to Perwez | 1,050.85 mi (1,691.19 km) |
| Porvoo to Philippeville | 1,080.49 mi (1,738.89 km) |
