| Melzo to Olympia Heights (Florida) | 4,961.16 mi (7,984.22 km) |
| Melzo to Omaha (Nebraska) | 4,887.61 mi (7,865.85 km) |
| Melzo to On Top of the World Designated Place (Florida) | 4,892.34 mi (7,873.46 km) |
| Melzo to Onalaska (Wisconsin) | 4,583.54 mi (7,376.50 km) |
| Melzo to Oneida (New York) | 4,002.11 mi (6,440.78 km) |
| Melzo to Oneonta (New York) | 4,001.58 mi (6,439.92 km) |
| Melzo to Ontario (California) | 6,022.27 mi (9,691.91 km) |
| Melzo to Ontario (Oregon) | 5,434.67 mi (8,746.26 km) |
| Melzo to Opa-locka (Florida) | 4,949.13 mi (7,964.86 km) |
| Melzo to Opelika (Alabama) | 4,863.51 mi (7,827.06 km) |
| Melzo to Opelousas (Louisiana) | 5,251.11 mi (8,450.84 km) |
| Melzo to Orange (California) | 6,042.67 mi (9,724.73 km) |
| Melzo to Orange (Texas) | 5,341.34 mi (8,596.06 km) |
| Melzo to Orange City (Florida) | 4,855.41 mi (7,814.03 km) |
| Melzo to Orangeburg (South Carolina) | 4,629.39 mi (7,450.28 km) |
