| Gallarate to Olympia Heights (Florida) | 4,928.88 mi (7,932.26 km) |
| Gallarate to Omaha (Nebraska) | 4,857.06 mi (7,816.69 km) |
| Gallarate to On Top of the World Designated Place (Florida) | 4,860.04 mi (7,821.48 km) |
| Gallarate to Onalaska (Wisconsin) | 4,552.90 mi (7,327.19 km) |
| Gallarate to Oneida (New York) | 3,970.29 mi (6,389.56 km) |
| Gallarate to Oneonta (New York) | 3,969.67 mi (6,388.57 km) |
| Gallarate to Ontario (California) | 5,993.65 mi (9,645.85 km) |
| Gallarate to Ontario (Oregon) | 5,407.56 mi (8,702.63 km) |
| Gallarate to Opa-locka (Florida) | 4,916.84 mi (7,912.90 km) |
| Gallarate to Opelika (Alabama) | 4,831.38 mi (7,775.36 km) |
| Gallarate to Opelousas (Louisiana) | 5,219.16 mi (8,399.43 km) |
| Gallarate to Orange (California) | 6,014.05 mi (9,678.68 km) |
| Gallarate to Orange (Texas) | 5,309.47 mi (8,544.76 km) |
| Gallarate to Orange City (Florida) | 4,823.10 mi (7,762.03 km) |
| Gallarate to Orangeburg (South Carolina) | 4,597.16 mi (7,398.42 km) |
