| Washington Court House to Orbetello | 4,660.16 mi (7,499.81 km) |
| Washington Court House to Oria | 5,008.37 mi (8,060.20 km) |
| Washington Court House to Oristano | 4,642.96 mi (7,472.12 km) |
| Washington Court House to Orta Nova | 4,893.66 mi (7,875.58 km) |
| Washington Court House to Orte | 4,708.98 mi (7,578.38 km) |
| Washington Court House to Ortona | 4,797.72 mi (7,721.18 km) |
| Washington Court House to Orvieto | 4,687.37 mi (7,543.59 km) |
| Washington Court House to Orzinuovi | 4,495.86 mi (7,235.39 km) |
| Washington Court House to Osimo | 4,714.88 mi (7,587.86 km) |
| Washington Court House to Ospitaletto | 4,495.95 mi (7,235.53 km) |
| Washington Court House to Ostuni | 4,996.49 mi (8,041.08 km) |
| Washington Court House to Ottaviano | 4,861.25 mi (7,823.42 km) |
| Washington Court House to Ovada | 4,470.02 mi (7,193.80 km) |
| Washington Court House to Ozieri | 4,635.39 mi (7,459.94 km) |
| Washington Court House to Paceco | 4,893.46 mi (7,875.27 km) |
