| Fagnano Olona to Olympia Heights (Florida) | 4,932.30 mi (7,937.76 km) |
| Fagnano Olona to Omaha (Nebraska) | 4,859.79 mi (7,821.08 km) |
| Fagnano Olona to On Top of the World Designated Place (Florida) | 4,863.36 mi (7,826.83 km) |
| Fagnano Olona to Onalaska (Wisconsin) | 4,555.65 mi (7,331.61 km) |
| Fagnano Olona to Oneida (New York) | 3,973.36 mi (6,394.50 km) |
| Fagnano Olona to Oneonta (New York) | 3,972.77 mi (6,393.56 km) |
| Fagnano Olona to Ontario (California) | 5,995.98 mi (9,649.60 km) |
| Fagnano Olona to Ontario (Oregon) | 5,409.63 mi (8,705.96 km) |
| Fagnano Olona to Opa-locka (Florida) | 4,920.26 mi (7,918.39 km) |
| Fagnano Olona to Opelika (Alabama) | 4,834.58 mi (7,780.50 km) |
| Fagnano Olona to Opelousas (Louisiana) | 5,222.28 mi (8,404.45 km) |
| Fagnano Olona to Orange (California) | 6,016.38 mi (9,682.43 km) |
| Fagnano Olona to Orange (Texas) | 5,312.56 mi (8,549.74 km) |
| Fagnano Olona to Orange City (Florida) | 4,826.44 mi (7,767.41 km) |
| Fagnano Olona to Orangeburg (South Carolina) | 4,600.41 mi (7,403.65 km) |
