| Gebze to Opole | 876.72 mi (1,410.95 km) |
| Gebze to Orzesze | 826.09 mi (1,329.46 km) |
| Gebze to Osowa | 1,068.23 mi (1,719.16 km) |
| Gebze to Ostroda | 993.75 mi (1,599.29 km) |
| Gebze to Ostroleka | 923.92 mi (1,486.91 km) |
| Gebze to Ostrow Mazowiecka | 901.25 mi (1,450.42 km) |
| Gebze to Ostrow Wielkopolski | 930.48 mi (1,497.47 km) |
| Gebze to Ostrowiec Swietokrzyski | 798.64 mi (1,285.28 km) |
| Gebze to Ostrzeszow | 915.06 mi (1,472.64 km) |
| Gebze to Oswiecim | 806.34 mi (1,297.68 km) |
| Gebze to Otwock | 871.90 mi (1,403.19 km) |
| Gebze to Ozarow Mazowiecki | 887.80 mi (1,428.78 km) |
| Gebze to Ozimek | 868.69 mi (1,398.02 km) |
| Gebze to Ozorkow | 908.74 mi (1,462.47 km) |
| Gebze to Pabianice | 888.55 mi (1,429.98 km) |
