| Melfi to Olympia Heights (Florida) | 5,365.37 mi (8,634.73 km) |
| Melfi to Omaha (Nebraska) | 5,328.55 mi (8,575.47 km) |
| Melfi to On Top of the World Designated Place (Florida) | 5,307.49 mi (8,541.58 km) |
| Melfi to Onalaska (Wisconsin) | 5,024.28 mi (8,085.80 km) |
| Melfi to Oneida (New York) | 4,434.82 mi (7,137.16 km) |
| Melfi to Oneonta (New York) | 4,432.92 mi (7,134.09 km) |
| Melfi to Ontario (California) | 6,461.31 mi (10,398.48 km) |
| Melfi to Ontario (Oregon) | 5,867.75 mi (9,443.24 km) |
| Melfi to Opa-locka (Florida) | 5,353.60 mi (8,615.79 km) |
| Melfi to Opelika (Alabama) | 5,289.37 mi (8,512.42 km) |
| Melfi to Opelousas (Louisiana) | 5,681.42 mi (9,143.37 km) |
| Melfi to Orange (California) | 6,481.69 mi (10,431.28 km) |
| Melfi to Orange (Texas) | 5,772.90 mi (9,290.58 km) |
| Melfi to Orange City (Florida) | 5,268.62 mi (8,479.02 km) |
| Melfi to Orangeburg (South Carolina) | 5,051.15 mi (8,129.04 km) |
