| Ostrow Mazowiecka to Popovo | 682.57 mi (1,098.49 km) |
| Ostrow Mazowiecka to Provadia | 711.48 mi (1,145.02 km) |
| Ostrow Mazowiecka to Radnevo | 749.16 mi (1,205.65 km) |
| Ostrow Mazowiecka to Radomir | 709.87 mi (1,142.42 km) |
| Ostrow Mazowiecka to Rakitovo | 754.21 mi (1,213.79 km) |
| Ostrow Mazowiecka to Rakovski | 740.04 mi (1,190.98 km) |
| Ostrow Mazowiecka to Razgrad | 674.33 mi (1,085.23 km) |
| Ostrow Mazowiecka to Razlog | 757.78 mi (1,219.53 km) |
| Ostrow Mazowiecka to Ruse | 647.35 mi (1,041.80 km) |
| Ostrow Mazowiecka to Samokov | 726.97 mi (1,169.95 km) |
| Ostrow Mazowiecka to Sandanski | 778.72 mi (1,253.23 km) |
| Ostrow Mazowiecka to Sevlievo | 691.36 mi (1,112.64 km) |
| Ostrow Mazowiecka to Shumen | 697.01 mi (1,121.72 km) |
| Ostrow Mazowiecka to Silistra | 647.81 mi (1,042.55 km) |
| Ostrow Mazowiecka to Sliven | 728.36 mi (1,172.18 km) |
