| San Sebastiano al Vesuvio to Oakley (California) | 6,324.83 mi (10,178.83 km) |
| San Sebastiano al Vesuvio to Oakton (Virginia) | 4,617.96 mi (7,431.89 km) |
| San Sebastiano al Vesuvio to Oakville (Missouri) | 5,192.16 mi (8,355.97 km) |
| San Sebastiano al Vesuvio to Oatfield (Oregon) | 5,911.44 mi (9,513.54 km) |
| San Sebastiano al Vesuvio to Ocala (Florida) | 5,243.48 mi (8,438.57 km) |
| San Sebastiano al Vesuvio to Ocean Acres (New Jersey) | 4,450.96 mi (7,163.13 km) |
| San Sebastiano al Vesuvio to Ocean City (New Jersey) | 4,483.26 mi (7,215.11 km) |
| San Sebastiano al Vesuvio to Ocean Pines (Maryland) | 4,541.55 mi (7,308.91 km) |
| San Sebastiano al Vesuvio to Ocean Pointe (Hawaii) | 8,115.09 mi (13,059.98 km) |
| San Sebastiano al Vesuvio to Ocean Springs (Mississippi) | 5,491.96 mi (8,838.46 km) |
| San Sebastiano al Vesuvio to Oceanside (California) | 6,466.27 mi (10,406.45 km) |
| San Sebastiano al Vesuvio to Oceanside (New York) | 4,389.15 mi (7,063.65 km) |
| San Sebastiano al Vesuvio to Ocoee (Florida) | 5,240.58 mi (8,433.90 km) |
| San Sebastiano al Vesuvio to Oconomowoc (Wisconsin) | 4,913.07 mi (7,906.83 km) |
| San Sebastiano al Vesuvio to Odenton (Maryland) | 4,584.11 mi (7,377.42 km) |
