| Mount Vernon to Oerlinghausen | 3,785.23 mi (6,091.73 km) |
| Mount Vernon to Oestrich-Winkel | 3,813.84 mi (6,137.78 km) |
| Mount Vernon to Offenburg | 3,855.58 mi (6,204.96 km) |
| Mount Vernon to Oftersheim | 3,855.77 mi (6,205.27 km) |
| Mount Vernon to Ohrdruf | 3,898.88 mi (6,274.64 km) |
| Mount Vernon to Ohringen | 3,898.09 mi (6,273.37 km) |
| Mount Vernon to Olbernhau | 4,005.75 mi (6,446.64 km) |
| Mount Vernon to Olching | 4,003.06 mi (6,442.31 km) |
| Mount Vernon to Oldenburg | 3,735.97 mi (6,012.46 km) |
| Mount Vernon to Oldenburg in Holstein | 3,805.39 mi (6,124.18 km) |
| Mount Vernon to Olfen | 3,741.67 mi (6,021.63 km) |
| Mount Vernon to Olpe | 3,778.59 mi (6,081.06 km) |
| Mount Vernon to Olsberg | 3,795.11 mi (6,107.65 km) |
| Mount Vernon to Oranienburg | 3,937.75 mi (6,337.20 km) |
| Mount Vernon to Ortenberg | 3,846.10 mi (6,189.69 km) |
