| Melito di Napoli to Olympia Heights (Florida) | 5,299.62 mi (8,528.91 km) |
| Melito di Napoli to Omaha (Nebraska) | 5,279.25 mi (8,496.13 km) |
| Melito di Napoli to On Top of the World Designated Place (Florida) | 5,244.16 mi (8,439.66 km) |
| Melito di Napoli to Onalaska (Wisconsin) | 4,974.54 mi (8,005.75 km) |
| Melito di Napoli to Oneida (New York) | 4,377.98 mi (7,045.68 km) |
| Melito di Napoli to Oneonta (New York) | 4,375.38 mi (7,041.49 km) |
| Melito di Napoli to Ontario (California) | 6,420.67 mi (10,333.07 km) |
| Melito di Napoli to Ontario (Oregon) | 5,832.89 mi (9,387.12 km) |
| Melito di Napoli to Opa-locka (Florida) | 5,287.90 mi (8,510.06 km) |
| Melito di Napoli to Opelika (Alabama) | 5,229.31 mi (8,415.76 km) |
| Melito di Napoli to Opelousas (Louisiana) | 5,623.10 mi (9,049.51 km) |
| Melito di Napoli to Orange (California) | 6,441.07 mi (10,365.90 km) |
| Melito di Napoli to Orange (Texas) | 5,715.15 mi (9,197.64 km) |
| Melito di Napoli to Orange City (Florida) | 5,204.81 mi (8,376.34 km) |
| Melito di Napoli to Orangeburg (South Carolina) | 4,989.75 mi (8,030.22 km) |
