| Fort Thomas to Oswego (Illinois) | 272.29 mi (438.21 km) |
| Fort Thomas to Oswego (New York) | 511.23 mi (822.75 km) |
| Fort Thomas to Otsego (Minnesota) | 634.14 mi (1,020.54 km) |
| Fort Thomas to Ottawa (Illinois) | 279.19 mi (449.31 km) |
| Fort Thomas to Ottawa (Kansas) | 582.46 mi (937.38 km) |
| Fort Thomas to Ottumwa (Iowa) | 441.96 mi (711.27 km) |
| Fort Thomas to Overland (Missouri) | 319.27 mi (513.81 km) |
| Fort Thomas to Overland Park (Kansas) | 549.58 mi (884.47 km) |
| Fort Thomas to Overlea (Maryland) | 425.01 mi (683.99 km) |
| Fort Thomas to Oviedo (Florida) | 743.90 mi (1,197.19 km) |
| Fort Thomas to Owasso (Oklahoma) | 650.91 mi (1,047.55 km) |
| Fort Thomas to Owatonna (Minnesota) | 570.19 mi (917.63 km) |
| Fort Thomas to Owensboro (Kentucky) | 170.78 mi (274.84 km) |
| Fort Thomas to Owings Mills (Maryland) | 410.42 mi (660.50 km) |
| Fort Thomas to Owosso (Michigan) | 270.91 mi (435.99 km) |
