| Salsomaggiore Terme to Olympia Heights (Florida) | 5,002.38 mi (8,050.55 km) |
| Salsomaggiore Terme to Omaha (Nebraska) | 4,939.09 mi (7,948.70 km) |
| Salsomaggiore Terme to On Top of the World Designated Place (Florida) | 4,935.88 mi (7,943.54 km) |
| Salsomaggiore Terme to Onalaska (Wisconsin) | 4,634.85 mi (7,459.07 km) |
| Salsomaggiore Terme to Oneida (New York) | 4,050.06 mi (6,517.95 km) |
| Salsomaggiore Terme to Oneonta (New York) | 4,049.11 mi (6,516.42 km) |
| Salsomaggiore Terme to Ontario (California) | 6,075.94 mi (9,778.28 km) |
| Salsomaggiore Terme to Ontario (Oregon) | 5,489.09 mi (8,833.84 km) |
| Salsomaggiore Terme to Opa-locka (Florida) | 4,990.40 mi (8,031.27 km) |
| Salsomaggiore Terme to Opelika (Alabama) | 4,909.60 mi (7,901.25 km) |
| Salsomaggiore Terme to Opelousas (Louisiana) | 5,298.43 mi (8,527.00 km) |
| Salsomaggiore Terme to Orange (California) | 6,096.34 mi (9,811.11 km) |
| Salsomaggiore Terme to Orange (Texas) | 5,389.03 mi (8,672.80 km) |
| Salsomaggiore Terme to Orange City (Florida) | 4,898.52 mi (7,883.40 km) |
| Salsomaggiore Terme to Orangeburg (South Carolina) | 4,674.44 mi (7,522.78 km) |
