| Citrus to Olympia Heights (Florida) | 2,308.31 mi (3,714.86 km) |
| Citrus to Omaha (Nebraska) | 1,287.48 mi (2,072.00 km) |
| Citrus to On Top of the World Designated Place (Florida) | 2,112.52 mi (3,399.77 km) |
| Citrus to Onalaska (Wisconsin) | 1,574.39 mi (2,533.74 km) |
| Citrus to Oneida (New York) | 2,336.24 mi (3,759.81 km) |
| Citrus to Oneonta (New York) | 2,366.25 mi (3,808.11 km) |
| Citrus to Ontario (California) | 17.02 mi (27.40 km) |
| Citrus to Ontario (Oregon) | 686.44 mi (1,104.73 km) |
| Citrus to Opa-locka (Florida) | 2,308.25 mi (3,714.77 km) |
| Citrus to Opelika (Alabama) | 1,870.43 mi (3,010.16 km) |
| Citrus to Opelousas (Louisiana) | 1,522.97 mi (2,450.99 km) |
| Citrus to Orange (California) | 21.91 mi (35.27 km) |
| Citrus to Orange (Texas) | 1,435.11 mi (2,309.59 km) |
| Citrus to Orange City (Florida) | 2,173.43 mi (3,497.80 km) |
| Citrus to Orangeburg (South Carolina) | 2,114.18 mi (3,402.44 km) |
