| Forest Lake to Oerlinghausen | 4,272.37 mi (6,875.71 km) |
| Forest Lake to Oestrich-Winkel | 4,334.82 mi (6,976.22 km) |
| Forest Lake to Offenburg | 4,399.52 mi (7,080.35 km) |
| Forest Lake to Oftersheim | 4,382.58 mi (7,053.08 km) |
| Forest Lake to Ohrdruf | 4,391.11 mi (7,066.82 km) |
| Forest Lake to Ohringen | 4,421.81 mi (7,116.21 km) |
| Forest Lake to Olbernhau | 4,484.27 mi (7,216.73 km) |
| Forest Lake to Olching | 4,529.66 mi (7,289.79 km) |
| Forest Lake to Oldenburg | 4,207.16 mi (6,770.77 km) |
| Forest Lake to Oldenburg in Holstein | 4,243.25 mi (6,828.85 km) |
| Forest Lake to Olfen | 4,240.01 mi (6,823.64 km) |
| Forest Lake to Olpe | 4,285.17 mi (6,896.31 km) |
| Forest Lake to Olsberg | 4,292.82 mi (6,908.62 km) |
| Forest Lake to Oranienburg | 4,385.89 mi (7,058.42 km) |
| Forest Lake to Ortenberg | 4,355.48 mi (7,009.46 km) |
