| Nettuno to Olympia Heights (Florida) | 5,209.85 mi (8,384.44 km) |
| Nettuno to Omaha (Nebraska) | 5,193.78 mi (8,358.58 km) |
| Nettuno to On Top of the World Designated Place (Florida) | 5,154.30 mi (8,295.04 km) |
| Nettuno to Onalaska (Wisconsin) | 4,888.88 mi (7,867.89 km) |
| Nettuno to Oneida (New York) | 4,289.39 mi (6,903.11 km) |
| Nettuno to Oneonta (New York) | 4,286.57 mi (6,898.57 km) |
| Nettuno to Ontario (California) | 6,340.08 mi (10,203.37 km) |
| Nettuno to Ontario (Oregon) | 5,756.32 mi (9,263.91 km) |
| Nettuno to Opa-locka (Florida) | 5,198.13 mi (8,365.58 km) |
| Nettuno to Opelika (Alabama) | 5,139.85 mi (8,271.79 km) |
| Nettuno to Opelousas (Louisiana) | 5,534.04 mi (8,906.18 km) |
| Nettuno to Orange (California) | 6,360.49 mi (10,236.22 km) |
| Nettuno to Orange (Texas) | 5,626.25 mi (9,054.57 km) |
| Nettuno to Orange City (Florida) | 5,114.94 mi (8,231.69 km) |
| Nettuno to Orangeburg (South Carolina) | 4,900.06 mi (7,885.89 km) |
