| Ostrow Mazowiecka to Oberriet | 664.07 mi (1,068.71 km) |
| Ostrow Mazowiecka to Obersiggenthal | 703.88 mi (1,132.78 km) |
| Ostrow Mazowiecka to Oberwil | 730.70 mi (1,175.95 km) |
| Ostrow Mazowiecka to Oberwingert | 684.80 mi (1,102.08 km) |
| Ostrow Mazowiecka to Oftringen | 724.99 mi (1,166.75 km) |
| Ostrow Mazowiecka to Olten | 724.24 mi (1,165.56 km) |
| Ostrow Mazowiecka to Onex | 840.91 mi (1,353.32 km) |
| Ostrow Mazowiecka to Opfikon | 695.82 mi (1,119.82 km) |
| Ostrow Mazowiecka to Ostermundigen | 756.08 mi (1,216.80 km) |
| Ostrow Mazowiecka to Payerne | 782.74 mi (1,259.69 km) |
| Ostrow Mazowiecka to Pfaffikon | 690.58 mi (1,111.38 km) |
| Ostrow Mazowiecka to Plan-les-Ouates | 841.01 mi (1,353.47 km) |
| Ostrow Mazowiecka to Pratteln | 725.04 mi (1,166.84 km) |
| Ostrow Mazowiecka to Prilly | 807.21 mi (1,299.08 km) |
| Ostrow Mazowiecka to Pully | 805.42 mi (1,296.21 km) |
