| Gebze to Oerlinghausen | 1,247.38 mi (2,007.47 km) |
| Gebze to Oestrich-Winkel | 1,212.17 mi (1,950.81 km) |
| Gebze to Offenburg | 1,176.88 mi (1,894.00 km) |
| Gebze to Oftersheim | 1,171.15 mi (1,884.79 km) |
| Gebze to Ohrdruf | 1,130.81 mi (1,819.86 km) |
| Gebze to Ohringen | 1,128.57 mi (1,816.25 km) |
| Gebze to Olbernhau | 1,029.27 mi (1,656.44 km) |
| Gebze to Olching | 1,025.14 mi (1,649.81 km) |
| Gebze to Oldenburg | 1,305.71 mi (2,101.34 km) |
| Gebze to Oldenburg in Holstein | 1,264.48 mi (2,034.98 km) |
| Gebze to Olfen | 1,287.23 mi (2,071.60 km) |
| Gebze to Olpe | 1,248.21 mi (2,008.80 km) |
| Gebze to Olsberg | 1,233.59 mi (1,985.28 km) |
| Gebze to Oranienburg | 1,121.65 mi (1,805.11 km) |
| Gebze to Ortenberg | 1,180.09 mi (1,899.16 km) |
