| Willoughby to Oak Grove (South Carolina) | 529.99 mi (852.94 km) |
| Willoughby to Oak Harbor (Washington) | 2,040.75 mi (3,284.27 km) |
| Willoughby to Oak Hills (Oregon) | 2,067.43 mi (3,327.21 km) |
| Willoughby to Oak Lawn (Illinois) | 327.35 mi (526.83 km) |
| Willoughby to Oak Park (California) | 2,083.10 mi (3,352.43 km) |
| Willoughby to Oak Park (Illinois) | 329.21 mi (529.82 km) |
| Willoughby to Oak Park (Michigan) | 107.16 mi (172.46 km) |
| Willoughby to Oak Ridge (Florida) | 910.18 mi (1,464.79 km) |
| Willoughby to Oak Ridge (New Jersey) | 360.93 mi (580.86 km) |
| Willoughby to Oak Ridge (Tennessee) | 422.14 mi (679.37 km) |
| Willoughby to Oakdale (California) | 2,095.13 mi (3,371.78 km) |
| Willoughby to Oakdale (Minnesota) | 624.40 mi (1,004.87 km) |
| Willoughby to Oakland (California) | 2,164.75 mi (3,483.83 km) |
| Willoughby to Oakland (New Jersey) | 374.14 mi (602.11 km) |
| Willoughby to Oakland Park (Florida) | 1,071.12 mi (1,723.79 km) |
