| Willoughby to Clemson (South Carolina) | 487.03 mi (783.80 km) |
| Willoughby to Clermont (Florida) | 906.22 mi (1,458.42 km) |
| Willoughby to Cleveland (Mississippi) | 745.89 mi (1,200.40 km) |
| Willoughby to Cleveland (Ohio) | 18.30 mi (29.46 km) |
| Willoughby to Cleveland (Tennessee) | 484.26 mi (779.33 km) |
| Willoughby to Cleveland Heights (Ohio) | 12.28 mi (19.77 km) |
| Willoughby to Cliffside Park (New Jersey) | 389.62 mi (627.03 km) |
| Willoughby to Clifton (Colorado) | 1,429.30 mi (2,300.24 km) |
| Willoughby to Clifton (New Jersey) | 380.38 mi (612.17 km) |
| Willoughby to Clinton (Iowa) | 455.35 mi (732.82 km) |
| Willoughby to Clinton (Maryland) | 310.55 mi (499.78 km) |
| Willoughby to Clinton (Mississippi) | 808.38 mi (1,300.95 km) |
| Willoughby to Clinton (Utah) | 1,581.03 mi (2,544.42 km) |
| Willoughby to Clive (Iowa) | 639.30 mi (1,028.85 km) |
| Willoughby to Cloquet (Minnesota) | 650.69 mi (1,047.18 km) |
