| Fort Smith to Oswego (Illinois) | 545.45 mi (877.82 km) |
| Fort Smith to Oswego (New York) | 1,102.71 mi (1,774.64 km) |
| Fort Smith to Otsego (Minnesota) | 686.29 mi (1,104.48 km) |
| Fort Smith to Ottawa (Illinois) | 512.01 mi (824.00 km) |
| Fort Smith to Ottawa (Kansas) | 229.92 mi (370.01 km) |
| Fort Smith to Ottumwa (Iowa) | 405.80 mi (653.07 km) |
| Fort Smith to Overland (Missouri) | 319.59 mi (514.34 km) |
| Fort Smith to Overland Park (Kansas) | 245.04 mi (394.36 km) |
| Fort Smith to Overlea (Maryland) | 1,016.98 mi (1,636.67 km) |
| Fort Smith to Oviedo (Florida) | 898.95 mi (1,446.72 km) |
| Fort Smith to Owasso (Oklahoma) | 104.44 mi (168.08 km) |
| Fort Smith to Owatonna (Minnesota) | 607.00 mi (976.87 km) |
| Fort Smith to Owensboro (Kentucky) | 435.39 mi (700.69 km) |
| Fort Smith to Owings Mills (Maryland) | 1,003.19 mi (1,614.49 km) |
| Fort Smith to Owosso (Michigan) | 758.67 mi (1,220.95 km) |
