| Ostrow Mazowiecka to Nowy Dwor Mazowiecki | 55.73 mi (89.69 km) |
| Ostrow Mazowiecka to Nowy Sacz | 225.53 mi (362.95 km) |
| Ostrow Mazowiecka to Nowy Targ | 244.33 mi (393.22 km) |
| Ostrow Mazowiecka to Nowy Tomysl | 244.46 mi (393.41 km) |
| Ostrow Mazowiecka to Nysa | 253.35 mi (407.72 km) |
| Ostrow Mazowiecka to Oborniki | 212.92 mi (342.67 km) |
| Ostrow Mazowiecka to Oborniki Slaskie | 236.29 mi (380.28 km) |
| Ostrow Mazowiecka to Olawa | 234.77 mi (377.83 km) |
| Ostrow Mazowiecka to Olecko | 88.72 mi (142.78 km) |
| Ostrow Mazowiecka to Olesnica | 221.61 mi (356.64 km) |
| Ostrow Mazowiecka to Olesno | 199.47 mi (321.02 km) |
| Ostrow Mazowiecka to Olkusz | 200.86 mi (323.25 km) |
| Ostrow Mazowiecka to Olsztyn | 89.48 mi (144.01 km) |
| Ostrow Mazowiecka to Opalenica | 232.92 mi (374.85 km) |
| Ostrow Mazowiecka to Opoczno | 119.80 mi (192.80 km) |
