| Oak Grove to Oerlinghausen | 5,113.36 mi (8,229.16 km) |
| Oak Grove to Oestrich-Winkel | 5,210.96 mi (8,386.23 km) |
| Oak Grove to Offenburg | 5,297.84 mi (8,526.06 km) |
| Oak Grove to Oftersheim | 5,261.66 mi (8,467.83 km) |
| Oak Grove to Ohrdruf | 5,227.57 mi (8,412.96 km) |
| Oak Grove to Ohringen | 5,293.84 mi (8,519.61 km) |
| Oak Grove to Olbernhau | 5,295.59 mi (8,522.42 km) |
| Oak Grove to Olching | 5,396.17 mi (8,684.29 km) |
| Oak Grove to Oldenburg | 5,035.04 mi (8,103.12 km) |
| Oak Grove to Oldenburg in Holstein | 5,027.46 mi (8,090.91 km) |
| Oak Grove to Olfen | 5,097.37 mi (8,203.43 km) |
| Oak Grove to Olpe | 5,148.35 mi (8,285.47 km) |
| Oak Grove to Olsberg | 5,144.67 mi (8,279.55 km) |
| Oak Grove to Oranienburg | 5,168.91 mi (8,318.56 km) |
| Oak Grove to Ortenberg | 5,215.86 mi (8,394.11 km) |
