| Grain Valley to Orbetello | 5,126.40 mi (8,250.14 km) |
| Grain Valley to Oria | 5,465.44 mi (8,795.77 km) |
| Grain Valley to Oristano | 5,128.57 mi (8,253.64 km) |
| Grain Valley to Orta Nova | 5,352.52 mi (8,614.05 km) |
| Grain Valley to Orte | 5,171.85 mi (8,323.29 km) |
| Grain Valley to Ortona | 5,255.36 mi (8,457.69 km) |
| Grain Valley to Orvieto | 5,149.69 mi (8,287.63 km) |
| Grain Valley to Orzinuovi | 4,949.91 mi (7,966.12 km) |
| Grain Valley to Osimo | 5,169.35 mi (8,319.26 km) |
| Grain Valley to Ospitaletto | 4,948.77 mi (7,964.27 km) |
| Grain Valley to Ostuni | 5,452.58 mi (8,775.07 km) |
| Grain Valley to Ottaviano | 5,326.13 mi (8,571.58 km) |
| Grain Valley to Ovada | 4,931.62 mi (7,936.68 km) |
| Grain Valley to Ozieri | 5,116.71 mi (8,234.55 km) |
| Grain Valley to Paceco | 5,377.29 mi (8,653.92 km) |
