| Gunbarrel to Oerlinghausen | 4,944.01 mi (7,956.61 km) |
| Gunbarrel to Oestrich-Winkel | 5,014.36 mi (8,069.83 km) |
| Gunbarrel to Offenburg | 5,083.91 mi (8,181.75 km) |
| Gunbarrel to Oftersheim | 5,063.07 mi (8,148.22 km) |
| Gunbarrel to Ohrdruf | 5,062.77 mi (8,147.75 km) |
| Gunbarrel to Ohringen | 5,101.17 mi (8,209.55 km) |
| Gunbarrel to Olbernhau | 5,151.18 mi (8,290.02 km) |
| Gunbarrel to Olching | 5,208.72 mi (8,382.62 km) |
| Gunbarrel to Oldenburg | 4,875.32 mi (7,846.08 km) |
| Gunbarrel to Oldenburg in Holstein | 4,901.63 mi (7,888.41 km) |
| Gunbarrel to Olfen | 4,914.90 mi (7,909.77 km) |
| Gunbarrel to Olpe | 4,961.65 mi (7,985.01 km) |
| Gunbarrel to Olsberg | 4,966.97 mi (7,993.57 km) |
| Gunbarrel to Oranienburg | 5,045.38 mi (8,119.76 km) |
| Gunbarrel to Ortenberg | 5,031.93 mi (8,098.12 km) |
