| Forest Grove to Oerlinghausen | 5,117.81 mi (8,236.31 km) |
| Forest Grove to Oestrich-Winkel | 5,216.02 mi (8,394.37 km) |
| Forest Grove to Offenburg | 5,303.27 mi (8,534.79 km) |
| Forest Grove to Oftersheim | 5,266.73 mi (8,475.98 km) |
| Forest Grove to Ohrdruf | 5,231.81 mi (8,419.79 km) |
| Forest Grove to Ohringen | 5,298.73 mi (8,527.49 km) |
| Forest Grove to Olbernhau | 5,299.25 mi (8,528.33 km) |
| Forest Grove to Olching | 5,400.85 mi (8,691.82 km) |
| Forest Grove to Oldenburg | 5,039.31 mi (8,109.98 km) |
| Forest Grove to Oldenburg in Holstein | 5,030.87 mi (8,096.40 km) |
| Forest Grove to Olfen | 5,102.16 mi (8,211.14 km) |
| Forest Grove to Olpe | 5,153.21 mi (8,293.29 km) |
| Forest Grove to Olsberg | 5,149.30 mi (8,287.00 km) |
| Forest Grove to Oranienburg | 5,172.15 mi (8,323.78 km) |
| Forest Grove to Ortenberg | 5,220.59 mi (8,401.73 km) |
