| Ostrow Mazowiecka to Opole | 224.75 mi (361.69 km) |
| Ostrow Mazowiecka to Orzesze | 227.77 mi (366.56 km) |
| Ostrow Mazowiecka to Osowa | 179.95 mi (289.61 km) |
| Ostrow Mazowiecka to Ostroda | 101.26 mi (162.96 km) |
| Ostrow Mazowiecka to Ostroleka | 23.07 mi (37.13 km) |
| Ostrow Mazowiecka to Ostrow Wielkopolski | 190.21 mi (306.11 km) |
| Ostrow Mazowiecka to Ostrowiec Swietokrzyski | 130.73 mi (210.39 km) |
| Ostrow Mazowiecka to Ostrzeszow | 193.53 mi (311.46 km) |
| Ostrow Mazowiecka to Oswiecim | 222.98 mi (358.85 km) |
| Ostrow Mazowiecka to Otwock | 54.22 mi (87.26 km) |
| Ostrow Mazowiecka to Ozarow Mazowiecki | 61.35 mi (98.74 km) |
| Ostrow Mazowiecka to Ozimek | 215.55 mi (346.89 km) |
| Ostrow Mazowiecka to Ozorkow | 124.46 mi (200.30 km) |
| Ostrow Mazowiecka to Pabianice | 132.88 mi (213.84 km) |
| Ostrow Mazowiecka to Parczew | 90.40 mi (145.49 km) |
