| Front Royal to Oerlinghausen | 4,047.85 mi (6,514.38 km) |
| Front Royal to Oestrich-Winkel | 4,078.53 mi (6,563.75 km) |
| Front Royal to Offenburg | 4,121.47 mi (6,632.86 km) |
| Front Royal to Oftersheim | 4,120.83 mi (6,631.83 km) |
| Front Royal to Ohrdruf | 4,162.05 mi (6,698.18 km) |
| Front Royal to Ohringen | 4,163.06 mi (6,699.79 km) |
| Front Royal to Olbernhau | 4,268.26 mi (6,869.10 km) |
| Front Royal to Olching | 4,268.33 mi (6,869.21 km) |
| Front Royal to Oldenburg | 3,997.40 mi (6,433.20 km) |
| Front Royal to Oldenburg in Holstein | 4,064.49 mi (6,541.17 km) |
| Front Royal to Olfen | 4,004.91 mi (6,445.28 km) |
| Front Royal to Olpe | 4,042.41 mi (6,505.62 km) |
| Front Royal to Olsberg | 4,058.42 mi (6,531.40 km) |
| Front Royal to Oranienburg | 4,197.99 mi (6,756.00 km) |
| Front Royal to Ortenberg | 4,110.19 mi (6,614.72 km) |
