| Sinop to Oerlinghausen | 1,413.17 mi (2,274.28 km) |
| Sinop to Oestrich-Winkel | 1,404.55 mi (2,260.41 km) |
| Sinop to Offenburg | 1,388.10 mi (2,233.93 km) |
| Sinop to Oftersheim | 1,369.86 mi (2,204.58 km) |
| Sinop to Ohrdruf | 1,303.79 mi (2,098.25 km) |
| Sinop to Ohringen | 1,327.07 mi (2,135.70 km) |
| Sinop to Olbernhau | 1,193.11 mi (1,920.12 km) |
| Sinop to Olching | 1,231.85 mi (1,982.47 km) |
| Sinop to Oldenburg | 1,458.53 mi (2,347.27 km) |
| Sinop to Oldenburg in Holstein | 1,391.69 mi (2,239.72 km) |
| Sinop to Olfen | 1,460.27 mi (2,350.08 km) |
| Sinop to Olpe | 1,428.50 mi (2,298.95 km) |
| Sinop to Olsberg | 1,407.74 mi (2,265.54 km) |
| Sinop to Oranienburg | 1,256.67 mi (2,022.41 km) |
| Sinop to Ortenberg | 1,365.03 mi (2,196.80 km) |
