| Willoughby to Owosso (Michigan) | 169.35 mi (272.55 km) |
| Willoughby to Oxford (Alabama) | 607.12 mi (977.07 km) |
| Willoughby to Oxford (Mississippi) | 669.36 mi (1,077.23 km) |
| Willoughby to Oxford (Ohio) | 229.12 mi (368.74 km) |
| Willoughby to Oxnard (California) | 2,104.16 mi (3,386.32 km) |
| Willoughby to Oxon Hill (Maryland) | 306.11 mi (492.63 km) |
| Willoughby to Ozark (Alabama) | 742.40 mi (1,194.78 km) |
| Willoughby to Ozark (Missouri) | 705.90 mi (1,136.04 km) |
| Willoughby to Pace (Florida) | 826.37 mi (1,329.91 km) |
| Willoughby to Pacific Grove (California) | 2,178.77 mi (3,506.39 km) |
| Willoughby to Pacifica (California) | 2,182.45 mi (3,512.31 km) |
| Willoughby to Paducah (Kentucky) | 499.01 mi (803.07 km) |
| Willoughby to Pahrump (Nevada) | 1,883.19 mi (3,030.70 km) |
| Willoughby to Painesville (Ohio) | 9.64 mi (15.51 km) |
| Willoughby to Palatine (Illinois) | 342.76 mi (551.62 km) |
