| Oak Harbor to Olympia Heights (Florida) | 2,755.48 mi (4,434.51 km) |
| Oak Harbor to Omaha (Nebraska) | 1,382.72 mi (2,225.27 km) |
| Oak Harbor to On Top of the World Designated Place (Florida) | 2,506.47 mi (4,033.77 km) |
| Oak Harbor to Onalaska (Wisconsin) | 1,525.02 mi (2,454.29 km) |
| Oak Harbor to Oneida (New York) | 2,259.42 mi (3,636.18 km) |
| Oak Harbor to Oneonta (New York) | 2,305.54 mi (3,710.40 km) |
| Oak Harbor to Ontario (California) | 1,018.60 mi (1,639.27 km) |
| Oak Harbor to Ontario (Oregon) | 400.23 mi (644.11 km) |
| Oak Harbor to Opa-locka (Florida) | 2,750.44 mi (4,426.41 km) |
| Oak Harbor to Opelika (Alabama) | 2,206.08 mi (3,550.35 km) |
| Oak Harbor to Opelousas (Louisiana) | 2,019.13 mi (3,249.48 km) |
| Oak Harbor to Orange (California) | 1,031.71 mi (1,660.37 km) |
| Oak Harbor to Orange (Texas) | 1,971.08 mi (3,172.14 km) |
| Oak Harbor to Orange City (Florida) | 2,558.53 mi (4,117.55 km) |
| Oak Harbor to Orangeburg (South Carolina) | 2,371.91 mi (3,817.21 km) |
