| Campiglia Marittima to Olympia Heights (Florida) | 5,072.61 mi (8,163.58 km) |
| Campiglia Marittima to Omaha (Nebraska) | 5,041.95 mi (8,114.24 km) |
| Campiglia Marittima to On Top of the World Designated Place (Florida) | 5,012.93 mi (8,067.52 km) |
| Campiglia Marittima to Onalaska (Wisconsin) | 4,737.14 mi (7,623.69 km) |
| Campiglia Marittima to Oneida (New York) | 4,141.01 mi (6,664.30 km) |
| Campiglia Marittima to Oneonta (New York) | 4,138.73 mi (6,660.64 km) |
| Campiglia Marittima to Ontario (California) | 6,188.04 mi (9,958.69 km) |
| Campiglia Marittima to Ontario (Oregon) | 5,605.84 mi (9,021.73 km) |
| Campiglia Marittima to Opa-locka (Florida) | 5,060.79 mi (8,144.55 km) |
| Campiglia Marittima to Opelika (Alabama) | 4,994.37 mi (8,037.66 km) |
| Campiglia Marittima to Opelousas (Louisiana) | 5,386.90 mi (8,669.38 km) |
| Campiglia Marittima to Orange (California) | 6,208.45 mi (9,991.54 km) |
| Campiglia Marittima to Orange (Texas) | 5,478.63 mi (8,817.00 km) |
| Campiglia Marittima to Orange City (Florida) | 4,974.29 mi (8,005.34 km) |
| Campiglia Marittima to Orangeburg (South Carolina) | 4,756.09 mi (7,654.19 km) |
