| Ostrow Mazowiecka to Oststeinbek | 488.10 mi (785.52 km) |
| Ostrow Mazowiecka to Ottendorf-Okrilla | 361.09 mi (581.12 km) |
| Ostrow Mazowiecka to Ottersberg | 530.48 mi (853.72 km) |
| Ostrow Mazowiecka to Ottobrunn | 555.74 mi (894.38 km) |
| Ostrow Mazowiecka to Ottweiler | 680.56 mi (1,095.25 km) |
| Ostrow Mazowiecka to Overath | 634.59 mi (1,021.28 km) |
| Ostrow Mazowiecka to Oyten | 536.10 mi (862.77 km) |
| Ostrow Mazowiecka to Paderborn | 560.15 mi (901.48 km) |
| Ostrow Mazowiecka to Papenburg | 603.11 mi (970.61 km) |
| Ostrow Mazowiecka to Parchim | 419.35 mi (674.88 km) |
| Ostrow Mazowiecka to Pasewalk | 330.73 mi (532.25 km) |
| Ostrow Mazowiecka to Passau | 470.21 mi (756.74 km) |
| Ostrow Mazowiecka to Pattensen | 510.67 mi (821.85 km) |
| Ostrow Mazowiecka to Pegnitz | 493.89 mi (794.83 km) |
| Ostrow Mazowiecka to Peine | 490.61 mi (789.56 km) |
