| Sidney to Oerlinghausen | 4,208.85 mi (6,773.49 km) |
| Sidney to Oestrich-Winkel | 4,250.76 mi (6,840.93 km) |
| Sidney to Offenburg | 4,301.46 mi (6,922.52 km) |
| Sidney to Oftersheim | 4,295.22 mi (6,912.48 km) |
| Sidney to Ohrdruf | 4,325.40 mi (6,961.07 km) |
| Sidney to Ohringen | 4,336.68 mi (6,979.22 km) |
| Sidney to Olbernhau | 4,427.77 mi (7,125.80 km) |
| Sidney to Olching | 4,443.51 mi (7,151.14 km) |
| Sidney to Oldenburg | 4,152.89 mi (6,683.43 km) |
| Sidney to Oldenburg in Holstein | 4,209.54 mi (6,774.60 km) |
| Sidney to Olfen | 4,169.30 mi (6,709.85 km) |
| Sidney to Olpe | 4,209.71 mi (6,774.88 km) |
| Sidney to Olsberg | 4,222.94 mi (6,796.16 km) |
| Sidney to Oranienburg | 4,347.19 mi (6,996.12 km) |
| Sidney to Ortenberg | 4,278.83 mi (6,886.11 km) |
