| Melville to Olympia Heights (Florida) | 1,113.85 mi (1,792.56 km) |
| Melville to Omaha (Nebraska) | 1,177.50 mi (1,895.01 km) |
| Melville to On Top of the World Designated Place (Florida) | 949.41 mi (1,527.92 km) |
| Melville to Onalaska (Wisconsin) | 932.05 mi (1,499.99 km) |
| Melville to Oneida (New York) | 196.32 mi (315.95 km) |
| Melville to Oneonta (New York) | 143.83 mi (231.47 km) |
| Melville to Ontario (California) | 2,443.53 mi (3,932.47 km) |
| Melville to Ontario (Oregon) | 2,208.05 mi (3,553.52 km) |
| Melville to Opa-locka (Florida) | 1,100.67 mi (1,771.36 km) |
| Melville to Opelika (Alabama) | 866.97 mi (1,395.25 km) |
| Melville to Opelousas (Louisiana) | 1,261.13 mi (2,029.59 km) |
| Melville to Orange (California) | 2,461.49 mi (3,961.38 km) |
| Melville to Orange (Texas) | 1,356.58 mi (2,183.21 km) |
| Melville to Orange City (Florida) | 931.56 mi (1,499.19 km) |
| Melville to Orangeburg (South Carolina) | 649.41 mi (1,045.12 km) |
