| Sesto San Giovanni to Olympia Heights (Florida) | 4,952.01 mi (7,969.50 km) |
| Sesto San Giovanni to Omaha (Nebraska) | 4,879.32 mi (7,852.50 km) |
| Sesto San Giovanni to On Top of the World Designated Place (Florida) | 4,883.25 mi (7,858.84 km) |
| Sesto San Giovanni to Onalaska (Wisconsin) | 4,575.21 mi (7,363.09 km) |
| Sesto San Giovanni to Oneida (New York) | 3,993.30 mi (6,426.60 km) |
| Sesto San Giovanni to Oneonta (New York) | 3,992.73 mi (6,425.68 km) |
| Sesto San Giovanni to Ontario (California) | 6,014.66 mi (9,679.66 km) |
| Sesto San Giovanni to Ontario (Oregon) | 5,427.57 mi (8,734.82 km) |
| Sesto San Giovanni to Opa-locka (Florida) | 4,939.98 mi (7,950.13 km) |
| Sesto San Giovanni to Opelika (Alabama) | 4,854.55 mi (7,812.64 km) |
| Sesto San Giovanni to Opelousas (Louisiana) | 5,242.25 mi (8,436.58 km) |
| Sesto San Giovanni to Orange (California) | 6,035.06 mi (9,712.49 km) |
| Sesto San Giovanni to Orange (Texas) | 5,332.51 mi (8,581.85 km) |
| Sesto San Giovanni to Orange City (Florida) | 4,846.31 mi (7,799.38 km) |
| Sesto San Giovanni to Orangeburg (South Carolina) | 4,620.37 mi (7,435.76 km) |
