| Porvoo to Oestrich-Winkel | 994.40 mi (1,600.33 km) |
| Porvoo to Offenburg | 1,082.46 mi (1,742.04 km) |
| Porvoo to Oftersheim | 1,014.21 mi (1,632.22 km) |
| Porvoo to Ohrdruf | 877.06 mi (1,411.50 km) |
| Porvoo to Ohringen | 1,000.81 mi (1,610.65 km) |
| Porvoo to Olbernhau | 824.33 mi (1,326.63 km) |
| Porvoo to Olching | 1,017.25 mi (1,637.10 km) |
| Porvoo to Oldenburg | 824.93 mi (1,327.60 km) |
| Porvoo to Oldenburg in Holstein | 690.91 mi (1,111.91 km) |
| Porvoo to Olfen | 920.20 mi (1,480.92 km) |
| Porvoo to Olpe | 943.93 mi (1,519.11 km) |
| Porvoo to Olsberg | 908.21 mi (1,461.62 km) |
| Porvoo to Oranienburg | 706.49 mi (1,136.99 km) |
| Porvoo to Ortenberg | 946.72 mi (1,523.61 km) |
| Porvoo to Oschatz | 792.24 mi (1,274.99 km) |
