| Sinop to Opole | 1,011.22 mi (1,627.41 km) |
| Sinop to Orzesze | 962.36 mi (1,548.76 km) |
| Sinop to Osowa | 1,144.67 mi (1,842.17 km) |
| Sinop to Ostroda | 1,065.99 mi (1,715.55 km) |
| Sinop to Ostroleka | 988.18 mi (1,590.32 km) |
| Sinop to Ostrow Mazowiecka | 965.32 mi (1,553.54 km) |
| Sinop to Ostrow Wielkopolski | 1,050.53 mi (1,690.67 km) |
| Sinop to Ostrowiec Swietokrzyski | 895.51 mi (1,441.18 km) |
| Sinop to Ostrzeszow | 1,037.71 mi (1,670.04 km) |
| Sinop to Oswiecim | 940.37 mi (1,513.39 km) |
| Sinop to Otwock | 952.29 mi (1,532.57 km) |
| Sinop to Ozarow Mazowiecki | 971.73 mi (1,563.85 km) |
| Sinop to Ozimek | 1,000.81 mi (1,610.65 km) |
| Sinop to Ozorkow | 1,011.27 mi (1,627.48 km) |
| Sinop to Pabianice | 994.92 mi (1,601.16 km) |
