| Ostrow Mazowiecka to Ordu | 1,106.90 mi (1,781.38 km) |
| Ostrow Mazowiecka to Ortahisar | 1,158.39 mi (1,864.25 km) |
| Ostrow Mazowiecka to Ortakent | 1,115.33 mi (1,794.94 km) |
| Ostrow Mazowiecka to Ortaklar | 1,065.11 mi (1,714.12 km) |
| Ostrow Mazowiecka to Ortakoy | 1,130.72 mi (1,819.72 km) |
| Ostrow Mazowiecka to Ortakoy | 1,069.37 mi (1,720.98 km) |
| Ostrow Mazowiecka to Osmaneli | 941.22 mi (1,514.75 km) |
| Ostrow Mazowiecka to Osmaniye | 1,288.17 mi (2,073.12 km) |
| Ostrow Mazowiecka to Ozdere | 1,051.68 mi (1,692.51 km) |
| Ostrow Mazowiecka to Palu | 1,298.75 mi (2,090.14 km) |
| Ostrow Mazowiecka to Pamukkale | 1,085.05 mi (1,746.21 km) |
| Ostrow Mazowiecka to Patnos | 1,365.53 mi (2,197.61 km) |
| Ostrow Mazowiecka to Pazar | 1,100.17 mi (1,770.55 km) |
| Ostrow Mazowiecka to Pazarcik | 1,291.25 mi (2,078.07 km) |
| Ostrow Mazowiecka to Pazaryeri | 961.62 mi (1,547.58 km) |
