| San Giovanni Rotondo to Olympia Heights (Florida) | 5,350.10 mi (8,610.15 km) |
| San Giovanni Rotondo to Omaha (Nebraska) | 5,297.93 mi (8,526.19 km) |
| San Giovanni Rotondo to On Top of the World Designated Place (Florida) | 5,289.20 mi (8,512.15 km) |
| San Giovanni Rotondo to Onalaska (Wisconsin) | 4,994.00 mi (8,037.06 km) |
| San Giovanni Rotondo to Oneida (New York) | 4,410.13 mi (7,097.42 km) |
| San Giovanni Rotondo to Oneonta (New York) | 4,408.85 mi (7,095.36 km) |
| San Giovanni Rotondo to Ontario (California) | 6,425.38 mi (10,340.65 km) |
| San Giovanni Rotondo to Ontario (Oregon) | 5,829.07 mi (9,380.97 km) |
| San Giovanni Rotondo to Opa-locka (Florida) | 5,338.26 mi (8,591.10 km) |
| San Giovanni Rotondo to Opelika (Alabama) | 5,267.57 mi (8,477.34 km) |
| San Giovanni Rotondo to Opelousas (Louisiana) | 5,657.90 mi (9,105.51 km) |
| San Giovanni Rotondo to Orange (California) | 6,445.75 mi (10,373.43 km) |
| San Giovanni Rotondo to Orange (Texas) | 5,748.83 mi (9,251.85 km) |
| San Giovanni Rotondo to Orange City (Florida) | 5,250.89 mi (8,450.49 km) |
| San Giovanni Rotondo to Orangeburg (South Carolina) | 5,030.75 mi (8,096.22 km) |
