| Three Lakes to Oerlinghausen | 4,803.30 mi (7,730.17 km) |
| Three Lakes to Oestrich-Winkel | 4,812.67 mi (7,745.25 km) |
| Three Lakes to Offenburg | 4,839.47 mi (7,788.38 km) |
| Three Lakes to Oftersheim | 4,849.99 mi (7,805.30 km) |
| Three Lakes to Ohrdruf | 4,911.25 mi (7,903.89 km) |
| Three Lakes to Ohringen | 4,892.88 mi (7,874.34 km) |
| Three Lakes to Olbernhau | 5,022.54 mi (8,083.00 km) |
| Three Lakes to Olching | 4,993.11 mi (8,035.63 km) |
| Three Lakes to Oldenburg | 4,763.34 mi (7,665.86 km) |
| Three Lakes to Oldenburg in Holstein | 4,846.56 mi (7,799.79 km) |
| Three Lakes to Olfen | 4,755.06 mi (7,652.53 km) |
| Three Lakes to Olpe | 4,786.51 mi (7,703.15 km) |
| Three Lakes to Olsberg | 4,807.37 mi (7,736.72 km) |
| Three Lakes to Oranienburg | 4,971.17 mi (8,000.32 km) |
| Three Lakes to Ortenberg | 4,850.57 mi (7,806.23 km) |
