| Grain Valley to Oerlinghausen | 4,635.83 mi (7,460.64 km) |
| Grain Valley to Oestrich-Winkel | 4,689.60 mi (7,547.18 km) |
| Grain Valley to Offenburg | 4,748.16 mi (7,641.43 km) |
| Grain Valley to Oftersheim | 4,736.03 mi (7,621.91 km) |
| Grain Valley to Ohrdruf | 4,754.02 mi (7,650.85 km) |
| Grain Valley to Ohringen | 4,776.38 mi (7,686.85 km) |
| Grain Valley to Olbernhau | 4,851.29 mi (7,807.40 km) |
| Grain Valley to Olching | 4,884.10 mi (7,860.21 km) |
| Grain Valley to Oldenburg | 4,574.24 mi (7,361.53 km) |
| Grain Valley to Oldenburg in Holstein | 4,618.61 mi (7,432.94 km) |
| Grain Valley to Olfen | 4,600.32 mi (7,403.50 km) |
| Grain Valley to Olpe | 4,643.57 mi (7,473.11 km) |
| Grain Valley to Olsberg | 4,653.65 mi (7,489.32 km) |
| Grain Valley to Oranienburg | 4,759.76 mi (7,660.09 km) |
| Grain Valley to Ortenberg | 4,713.58 mi (7,585.77 km) |
