| North Hykeham to Oerlinghausen | 397.26 mi (639.33 km) |
| North Hykeham to Oestrich-Winkel | 428.83 mi (690.14 km) |
| North Hykeham to Offenburg | 493.89 mi (794.83 km) |
| North Hykeham to Oftersheim | 475.42 mi (765.12 km) |
| North Hykeham to Ohrdruf | 507.59 mi (816.88 km) |
| North Hykeham to Ohringen | 515.57 mi (829.73 km) |
| North Hykeham to Olbernhau | 616.98 mi (992.93 km) |
| North Hykeham to Olching | 623.31 mi (1,003.13 km) |
| North Hykeham to Oldenburg | 364.37 mi (586.39 km) |
| North Hykeham to Oldenburg in Holstein | 474.50 mi (763.63 km) |
| North Hykeham to Olfen | 350.39 mi (563.90 km) |
| North Hykeham to Olpe | 387.19 mi (623.12 km) |
| North Hykeham to Olsberg | 403.60 mi (649.52 km) |
| North Hykeham to Oranienburg | 575.12 mi (925.56 km) |
| North Hykeham to Ortenberg | 455.75 mi (733.45 km) |
