| Martinsburg to Olympia Heights (Florida) | 958.74 mi (1,542.94 km) |
| Martinsburg to Omaha (Nebraska) | 957.99 mi (1,541.74 km) |
| Martinsburg to On Top of the World Designated Place (Florida) | 756.14 mi (1,216.88 km) |
| Martinsburg to Onalaska (Wisconsin) | 747.12 mi (1,202.37 km) |
| Martinsburg to Oneida (New York) | 277.41 mi (446.45 km) |
| Martinsburg to Oneonta (New York) | 256.77 mi (413.23 km) |
| Martinsburg to Ontario (California) | 2,207.60 mi (3,552.78 km) |
| Martinsburg to Ontario (Oregon) | 2,015.95 mi (3,244.36 km) |
| Martinsburg to Opa-locka (Florida) | 946.02 mi (1,522.47 km) |
| Martinsburg to Opelika (Alabama) | 625.11 mi (1,006.01 km) |
| Martinsburg to Opelousas (Louisiana) | 1,006.99 mi (1,620.60 km) |
| Martinsburg to Orange (California) | 2,225.08 mi (3,580.92 km) |
| Martinsburg to Orange (Texas) | 1,100.95 mi (1,771.81 km) |
| Martinsburg to Orange City (Florida) | 751.14 mi (1,208.85 km) |
| Martinsburg to Orangeburg (South Carolina) | 442.26 mi (711.75 km) |
