| Ferentino to Olympia Heights (Florida) | 5,232.30 mi (8,420.58 km) |
| Ferentino to Omaha (Nebraska) | 5,205.79 mi (8,377.90 km) |
| Ferentino to On Top of the World Designated Place (Florida) | 5,175.02 mi (8,328.39 km) |
| Ferentino to Onalaska (Wisconsin) | 4,901.11 mi (7,887.58 km) |
| Ferentino to Oneida (New York) | 4,305.84 mi (6,929.57 km) |
| Ferentino to Oneonta (New York) | 4,303.45 mi (6,925.74 km) |
| Ferentino to Ontario (California) | 6,347.44 mi (10,215.22 km) |
| Ferentino to Ontario (Oregon) | 5,760.61 mi (9,270.81 km) |
| Ferentino to Opa-locka (Florida) | 5,220.54 mi (8,401.65 km) |
| Ferentino to Opelika (Alabama) | 5,158.38 mi (8,301.61 km) |
| Ferentino to Opelousas (Louisiana) | 5,551.47 mi (8,934.23 km) |
| Ferentino to Orange (California) | 6,367.85 mi (10,248.06 km) |
| Ferentino to Orange (Texas) | 5,643.32 mi (9,082.04 km) |
| Ferentino to Orange City (Florida) | 5,135.99 mi (8,265.57 km) |
| Ferentino to Orangeburg (South Carolina) | 4,919.47 mi (7,917.12 km) |
