| Royal Leamington Spa to Olympia Heights (Florida) | 4,368.84 mi (7,030.98 km) |
| Royal Leamington Spa to Omaha (Nebraska) | 4,211.27 mi (6,777.38 km) |
| Royal Leamington Spa to On Top of the World Designated Place (Florida) | 4,278.13 mi (6,884.98 km) |
| Royal Leamington Spa to Onalaska (Wisconsin) | 3,908.24 mi (6,289.71 km) |
| Royal Leamington Spa to Oneida (New York) | 3,351.46 mi (5,393.66 km) |
| Royal Leamington Spa to Oneonta (New York) | 3,354.45 mi (5,398.46 km) |
| Royal Leamington Spa to Ontario (California) | 5,339.82 mi (8,593.61 km) |
| Royal Leamington Spa to Ontario (Oregon) | 4,756.61 mi (7,655.03 km) |
| Royal Leamington Spa to Opa-locka (Florida) | 4,356.36 mi (7,010.88 km) |
| Royal Leamington Spa to Opelika (Alabama) | 4,226.45 mi (6,801.82 km) |
| Royal Leamington Spa to Opelousas (Louisiana) | 4,603.01 mi (7,407.82 km) |
| Royal Leamington Spa to Orange (California) | 5,360.22 mi (8,626.44 km) |
| Royal Leamington Spa to Orange (Texas) | 4,690.23 mi (7,548.19 km) |
| Royal Leamington Spa to Orange City (Florida) | 4,245.43 mi (6,832.35 km) |
| Royal Leamington Spa to Orangeburg (South Carolina) | 4,002.29 mi (6,441.06 km) |
