| Boone to Oerlinghausen | 4,315.33 mi (6,944.85 km) |
| Boone to Oestrich-Winkel | 4,345.88 mi (6,994.02 km) |
| Boone to Offenburg | 4,388.48 mi (7,062.57 km) |
| Boone to Oftersheim | 4,388.10 mi (7,061.97 km) |
| Boone to Ohrdruf | 4,429.54 mi (7,128.66 km) |
| Boone to Ohringen | 4,430.35 mi (7,129.96 km) |
| Boone to Olbernhau | 4,535.74 mi (7,299.56 km) |
| Boone to Olching | 4,535.55 mi (7,299.27 km) |
| Boone to Oldenburg | 4,264.79 mi (6,863.52 km) |
| Boone to Oldenburg in Holstein | 4,331.49 mi (6,970.85 km) |
| Boone to Olfen | 4,272.40 mi (6,875.76 km) |
| Boone to Olpe | 4,309.87 mi (6,936.06 km) |
| Boone to Olsberg | 4,325.91 mi (6,961.88 km) |
| Boone to Oranienburg | 4,465.20 mi (7,186.04 km) |
| Boone to Ortenberg | 4,377.63 mi (7,045.11 km) |
