| Washington Court House to Oskaloosa (Iowa) | 499.27 mi (803.50 km) |
| Washington Court House to Oswego (Illinois) | 297.04 mi (478.04 km) |
| Washington Court House to Oswego (New York) | 448.79 mi (722.26 km) |
| Washington Court House to Otsego (Minnesota) | 652.62 mi (1,050.29 km) |
| Washington Court House to Ottawa (Illinois) | 310.29 mi (499.37 km) |
| Washington Court House to Ottawa (Kansas) | 637.73 mi (1,026.33 km) |
| Washington Court House to Ottumwa (Iowa) | 484.59 mi (779.88 km) |
| Washington Court House to Overland (Missouri) | 376.49 mi (605.90 km) |
| Washington Court House to Overland Park (Kansas) | 604.01 mi (972.06 km) |
| Washington Court House to Overlea (Maryland) | 368.80 mi (593.52 km) |
| Washington Court House to Oviedo (Florida) | 762.52 mi (1,227.16 km) |
| Washington Court House to Owasso (Oklahoma) | 711.70 mi (1,145.37 km) |
| Washington Court House to Owatonna (Minnesota) | 594.20 mi (956.27 km) |
| Washington Court House to Owensboro (Kentucky) | 233.99 mi (376.57 km) |
| Washington Court House to Owings Mills (Maryland) | 353.99 mi (569.69 km) |
