| Forest Grove to Oberkirch | 5,303.13 mi (8,534.56 km) |
| Forest Grove to Obernburg am Main | 5,252.74 mi (8,453.46 km) |
| Forest Grove to Obernkirchen | 5,110.76 mi (8,224.98 km) |
| Forest Grove to Oberschleissheim | 5,403.75 mi (8,696.49 km) |
| Forest Grove to Oberstdorf | 5,422.82 mi (8,727.19 km) |
| Forest Grove to Obertraubling | 5,375.00 mi (8,650.23 km) |
| Forest Grove to Obertshausen | 5,232.17 mi (8,420.36 km) |
| Forest Grove to Oberursel | 5,218.10 mi (8,397.72 km) |
| Forest Grove to Ochsenfurt | 5,285.76 mi (8,506.61 km) |
| Forest Grove to Ochsenhausen | 5,375.75 mi (8,651.43 km) |
| Forest Grove to Ochtrup | 5,069.52 mi (8,158.60 km) |
| Forest Grove to Odenthal | 5,135.05 mi (8,264.07 km) |
| Forest Grove to Oelde | 5,113.51 mi (8,229.40 km) |
| Forest Grove to Oelsnitz | 5,288.51 mi (8,511.03 km) |
| Forest Grove to Oer-Erkenschwick | 5,103.29 mi (8,212.96 km) |
