| Civitanova Marche to Olympia Heights (Florida) | 5,213.55 mi (8,390.40 km) |
| Civitanova Marche to Omaha (Nebraska) | 5,147.94 mi (8,284.81 km) |
| Civitanova Marche to On Top of the World Designated Place (Florida) | 5,148.79 mi (8,286.18 km) |
| Civitanova Marche to Onalaska (Wisconsin) | 4,844.11 mi (7,795.85 km) |
| Civitanova Marche to Oneida (New York) | 4,263.42 mi (6,861.31 km) |
| Civitanova Marche to Oneonta (New York) | 4,262.64 mi (6,860.05 km) |
| Civitanova Marche to Ontario (California) | 6,275.59 mi (10,099.59 km) |
| Civitanova Marche to Ontario (Oregon) | 5,681.00 mi (9,142.68 km) |
| Civitanova Marche to Opa-locka (Florida) | 5,201.62 mi (8,371.20 km) |
| Civitanova Marche to Opelika (Alabama) | 5,123.33 mi (8,245.20 km) |
| Civitanova Marche to Opelousas (Louisiana) | 5,512.03 mi (8,870.75 km) |
| Civitanova Marche to Orange (California) | 6,295.97 mi (10,132.38 km) |
| Civitanova Marche to Orange (Texas) | 5,602.50 mi (9,016.36 km) |
| Civitanova Marche to Orange City (Florida) | 5,111.16 mi (8,225.62 km) |
| Civitanova Marche to Orangeburg (South Carolina) | 4,887.99 mi (7,866.46 km) |
