| Ostrow Mazowiecka to Montana | 651.79 mi (1,048.95 km) |
| Ostrow Mazowiecka to Nova Zagora | 737.26 mi (1,186.50 km) |
| Ostrow Mazowiecka to Novi Iskar | 694.16 mi (1,117.15 km) |
| Ostrow Mazowiecka to Novi Pazar | 696.79 mi (1,121.38 km) |
| Ostrow Mazowiecka to Omurtag | 701.69 mi (1,129.26 km) |
| Ostrow Mazowiecka to Panagyurishte | 719.45 mi (1,157.85 km) |
| Ostrow Mazowiecka to Parvomay | 755.15 mi (1,215.30 km) |
| Ostrow Mazowiecka to Pavlikeni | 678.80 mi (1,092.43 km) |
| Ostrow Mazowiecka to Pazardzhik | 741.03 mi (1,192.57 km) |
| Ostrow Mazowiecka to Pernik | 706.70 mi (1,137.32 km) |
| Ostrow Mazowiecka to Peshtera | 752.21 mi (1,210.56 km) |
| Ostrow Mazowiecka to Petrich | 790.35 mi (1,271.94 km) |
| Ostrow Mazowiecka to Pleven | 660.84 mi (1,063.51 km) |
| Ostrow Mazowiecka to Plovdiv | 747.63 mi (1,203.19 km) |
| Ostrow Mazowiecka to Pomorie | 754.70 mi (1,214.57 km) |
