| Wilmington to Olympia (Washington) | 2,481.42 mi (3,993.45 km) |
| Wilmington to Olympia Heights (Florida) | 604.35 mi (972.60 km) |
| Wilmington to Omaha (Nebraska) | 1,102.81 mi (1,774.80 km) |
| Wilmington to On Top of the World Designated Place (Florida) | 437.30 mi (703.76 km) |
| Wilmington to Onalaska (Wisconsin) | 976.50 mi (1,571.52 km) |
| Wilmington to Oneida (New York) | 624.23 mi (1,004.60 km) |
| Wilmington to Oneonta (New York) | 589.73 mi (949.09 km) |
| Wilmington to Ontario (California) | 2,257.10 mi (3,632.45 km) |
| Wilmington to Ontario (Oregon) | 2,179.30 mi (3,507.25 km) |
| Wilmington to Opa-locka (Florida) | 591.33 mi (951.66 km) |
| Wilmington to Opelika (Alabama) | 444.82 mi (715.87 km) |
| Wilmington to Opelousas (Louisiana) | 865.75 mi (1,393.29 km) |
| Wilmington to Orange (California) | 2,272.55 mi (3,657.32 km) |
| Wilmington to Orange (Texas) | 969.22 mi (1,559.81 km) |
| Wilmington to Orange City (Florida) | 415.78 mi (669.13 km) |
