| Viareggio to Olympia Heights (Florida) | 5,036.65 mi (8,105.70 km) |
| Viareggio to Omaha (Nebraska) | 4,991.84 mi (8,033.59 km) |
| Viareggio to On Top of the World Designated Place (Florida) | 4,973.95 mi (8,004.80 km) |
| Viareggio to Onalaska (Wisconsin) | 4,687.26 mi (7,543.41 km) |
| Viareggio to Oneida (New York) | 4,095.91 mi (6,591.72 km) |
| Viareggio to Oneonta (New York) | 4,094.20 mi (6,588.98 km) |
| Viareggio to Ontario (California) | 6,134.15 mi (9,871.97 km) |
| Viareggio to Ontario (Oregon) | 5,550.11 mi (8,932.04 km) |
| Viareggio to Opa-locka (Florida) | 5,024.75 mi (8,086.56 km) |
| Viareggio to Opelika (Alabama) | 4,952.01 mi (7,969.49 km) |
| Viareggio to Opelousas (Louisiana) | 5,342.96 mi (8,598.66 km) |
| Viareggio to Orange (California) | 6,154.56 mi (9,904.81 km) |
| Viareggio to Orange (Texas) | 5,434.20 mi (8,745.50 km) |
| Viareggio to Orange City (Florida) | 4,935.87 mi (7,943.51 km) |
| Viareggio to Orangeburg (South Carolina) | 4,715.07 mi (7,588.17 km) |
