| Certaldo to Olympia Heights (Florida) | 5,081.27 mi (8,177.52 km) |
| Certaldo to Omaha (Nebraska) | 5,036.11 mi (8,104.84 km) |
| Certaldo to On Top of the World Designated Place (Florida) | 5,018.97 mi (8,077.25 km) |
| Certaldo to Onalaska (Wisconsin) | 4,731.60 mi (7,614.78 km) |
| Certaldo to Oneida (New York) | 4,141.07 mi (6,664.41 km) |
| Certaldo to Oneonta (New York) | 4,139.40 mi (6,661.71 km) |
| Certaldo to Ontario (California) | 6,176.60 mi (9,940.29 km) |
| Certaldo to Ontario (Oregon) | 5,590.92 mi (8,997.71 km) |
| Certaldo to Opa-locka (Florida) | 5,069.39 mi (8,158.40 km) |
| Certaldo to Opelika (Alabama) | 4,997.23 mi (8,042.27 km) |
| Certaldo to Opelousas (Louisiana) | 5,388.17 mi (8,671.43 km) |
| Certaldo to Orange (California) | 6,197.01 mi (9,973.12 km) |
| Certaldo to Orange (Texas) | 5,479.40 mi (8,818.23 km) |
| Certaldo to Orange City (Florida) | 4,980.83 mi (8,015.87 km) |
| Certaldo to Orangeburg (South Carolina) | 4,760.25 mi (7,660.88 km) |
