| Fort Leonard Wood to Olympia Heights (Florida) | 1,080.14 mi (1,738.31 km) |
| Fort Leonard Wood to Omaha (Nebraska) | 320.06 mi (515.08 km) |
| Fort Leonard Wood to On Top of the World Designated Place (Florida) | 823.14 mi (1,324.72 km) |
| Fort Leonard Wood to Onalaska (Wisconsin) | 426.40 mi (686.22 km) |
| Fort Leonard Wood to Oneida (New York) | 938.86 mi (1,510.95 km) |
| Fort Leonard Wood to Oneonta (New York) | 956.23 mi (1,538.90 km) |
| Fort Leonard Wood to Ontario (California) | 1,444.34 mi (2,324.44 km) |
| Fort Leonard Wood to Ontario (Oregon) | 1,362.09 mi (2,192.06 km) |
| Fort Leonard Wood to Opa-locka (Florida) | 1,073.60 mi (1,727.79 km) |
| Fort Leonard Wood to Opelika (Alabama) | 518.52 mi (834.47 km) |
| Fort Leonard Wood to Opelousas (Louisiana) | 499.62 mi (804.06 km) |
| Fort Leonard Wood to Orange (California) | 1,461.09 mi (2,351.39 km) |
| Fort Leonard Wood to Orange (Texas) | 535.65 mi (862.04 km) |
| Fort Leonard Wood to Orange City (Florida) | 872.22 mi (1,403.70 km) |
| Fort Leonard Wood to Orangeburg (South Carolina) | 697.00 mi (1,121.71 km) |
