| Somma Vesuviana to Olympia Heights (Florida) | 5,310.61 mi (8,546.59 km) |
| Somma Vesuviana to Omaha (Nebraska) | 5,289.06 mi (8,511.92 km) |
| Somma Vesuviana to On Top of the World Designated Place (Florida) | 5,255.04 mi (8,457.17 km) |
| Somma Vesuviana to Onalaska (Wisconsin) | 4,984.39 mi (8,021.60 km) |
| Somma Vesuviana to Oneida (New York) | 4,388.43 mi (7,062.49 km) |
| Somma Vesuviana to Oneonta (New York) | 4,385.88 mi (7,058.39 km) |
| Somma Vesuviana to Ontario (California) | 6,429.63 mi (10,347.50 km) |
| Somma Vesuviana to Ontario (Oregon) | 5,841.22 mi (9,400.54 km) |
| Somma Vesuviana to Opa-locka (Florida) | 5,298.89 mi (8,527.74 km) |
| Somma Vesuviana to Opelika (Alabama) | 5,239.99 mi (8,432.95 km) |
| Somma Vesuviana to Opelousas (Louisiana) | 5,633.66 mi (9,066.51 km) |
| Somma Vesuviana to Orange (California) | 6,450.03 mi (10,380.33 km) |
| Somma Vesuviana to Orange (Texas) | 5,725.67 mi (9,214.57 km) |
| Somma Vesuviana to Orange City (Florida) | 5,215.72 mi (8,393.88 km) |
| Somma Vesuviana to Orangeburg (South Carolina) | 5,000.51 mi (8,047.55 km) |
