| Lockport to Oerlinghausen | 4,285.38 mi (6,896.65 km) |
| Lockport to Oestrich-Winkel | 4,335.01 mi (6,976.53 km) |
| Lockport to Offenburg | 4,391.00 mi (7,066.63 km) |
| Lockport to Oftersheim | 4,380.81 mi (7,050.24 km) |
| Lockport to Ohrdruf | 4,403.09 mi (7,086.09 km) |
| Lockport to Ohringen | 4,421.58 mi (7,115.84 km) |
| Lockport to Olbernhau | 4,502.33 mi (7,245.80 km) |
| Lockport to Olching | 4,529.09 mi (7,288.86 km) |
| Lockport to Oldenburg | 4,225.80 mi (6,800.76 km) |
| Lockport to Oldenburg in Holstein | 4,274.92 mi (6,879.81 km) |
| Lockport to Olfen | 4,248.38 mi (6,837.11 km) |
| Lockport to Olpe | 4,290.67 mi (6,905.17 km) |
| Lockport to Olsberg | 4,301.87 mi (6,923.19 km) |
| Lockport to Oranienburg | 4,414.86 mi (7,105.03 km) |
| Lockport to Ortenberg | 4,360.43 mi (7,017.43 km) |
