| Kocaeli to Opole | 893.57 mi (1,438.06 km) |
| Kocaeli to Orzesze | 842.90 mi (1,356.52 km) |
| Kocaeli to Osowa | 1,081.26 mi (1,740.12 km) |
| Kocaeli to Ostroda | 1,006.24 mi (1,619.39 km) |
| Kocaeli to Ostroleka | 935.56 mi (1,505.64 km) |
| Kocaeli to Ostrow Mazowiecka | 912.79 mi (1,468.99 km) |
| Kocaeli to Ostrow Wielkopolski | 946.41 mi (1,523.10 km) |
| Kocaeli to Ostrowiec Swietokrzyski | 812.32 mi (1,307.31 km) |
| Kocaeli to Ostrzeszow | 931.14 mi (1,498.52 km) |
| Kocaeli to Oswiecim | 822.92 mi (1,324.36 km) |
| Kocaeli to Otwock | 884.60 mi (1,423.63 km) |
| Kocaeli to Ozarow Mazowiecki | 900.84 mi (1,449.76 km) |
| Kocaeli to Ozimek | 885.33 mi (1,424.81 km) |
| Kocaeli to Ozorkow | 923.28 mi (1,485.88 km) |
| Kocaeli to Pabianice | 903.32 mi (1,453.75 km) |
