| Portchester to Opole | 830.63 mi (1,336.77 km) |
| Portchester to Orzesze | 872.00 mi (1,403.35 km) |
| Portchester to Osowa | 854.81 mi (1,375.68 km) |
| Portchester to Ostroda | 909.53 mi (1,463.74 km) |
| Portchester to Ostroleka | 973.95 mi (1,567.42 km) |
| Portchester to Ostrow Mazowiecka | 988.06 mi (1,590.12 km) |
| Portchester to Ostrow Wielkopolski | 818.61 mi (1,317.43 km) |
| Portchester to Ostrowiec Swietokrzyski | 977.78 mi (1,573.58 km) |
| Portchester to Ostrzeszow | 824.78 mi (1,327.36 km) |
| Portchester to Oswiecim | 893.99 mi (1,438.75 km) |
| Portchester to Otwock | 963.48 mi (1,550.56 km) |
| Portchester to Ozarow Mazowiecki | 943.33 mi (1,518.15 km) |
| Portchester to Ozimek | 842.69 mi (1,356.18 km) |
| Portchester to Ozorkow | 879.93 mi (1,416.11 km) |
| Portchester to Pabianice | 885.62 mi (1,425.26 km) |
