| Willoughby to Oakleaf Plantation (Florida) | 793.34 mi (1,276.75 km) |
| Willoughby to Oakley (California) | 2,133.26 mi (3,433.14 km) |
| Willoughby to Oakton (Virginia) | 288.33 mi (464.02 km) |
| Willoughby to Oakville (Missouri) | 520.22 mi (837.21 km) |
| Willoughby to Oatfield (Oregon) | 2,056.72 mi (3,309.97 km) |
| Willoughby to Ocala (Florida) | 862.45 mi (1,387.98 km) |
| Willoughby to Ocean Acres (New Jersey) | 395.73 mi (636.86 km) |
| Willoughby to Ocean City (New Jersey) | 393.59 mi (633.42 km) |
| Willoughby to Ocean Pines (Maryland) | 400.43 mi (644.43 km) |
| Willoughby to Ocean Pointe (Hawaii) | 4,577.91 mi (7,367.44 km) |
| Willoughby to Ocean Springs (Mississippi) | 878.26 mi (1,413.42 km) |
| Willoughby to Oceanside (California) | 2,037.30 mi (3,278.72 km) |
| Willoughby to Oceanside (New York) | 410.28 mi (660.28 km) |
| Willoughby to Ocoee (Florida) | 902.82 mi (1,452.95 km) |
| Willoughby to Oconomowoc (Wisconsin) | 375.27 mi (603.94 km) |
