| Fort Smith to Olympia Heights (Florida) | 1,065.47 mi (1,714.70 km) |
| Fort Smith to Omaha (Nebraska) | 418.61 mi (673.68 km) |
| Fort Smith to On Top of the World Designated Place (Florida) | 826.59 mi (1,330.27 km) |
| Fort Smith to Onalaska (Wisconsin) | 613.37 mi (987.13 km) |
| Fort Smith to Oneida (New York) | 1,131.31 mi (1,820.66 km) |
| Fort Smith to Oneonta (New York) | 1,144.62 mi (1,842.10 km) |
| Fort Smith to Ontario (California) | 1,320.13 mi (2,124.54 km) |
| Fort Smith to Ontario (Oregon) | 1,337.15 mi (2,151.93 km) |
| Fort Smith to Opa-locka (Florida) | 1,061.29 mi (1,707.98 km) |
| Fort Smith to Opelika (Alabama) | 547.28 mi (880.76 km) |
| Fort Smith to Opelousas (Louisiana) | 358.73 mi (577.31 km) |
| Fort Smith to Orange (California) | 1,335.33 mi (2,149.01 km) |
| Fort Smith to Orange (Texas) | 362.87 mi (583.98 km) |
| Fort Smith to Orange City (Florida) | 883.22 mi (1,421.40 km) |
| Fort Smith to Orangeburg (South Carolina) | 779.55 mi (1,254.57 km) |
