| Willoughby to Clarksdale (Mississippi) | 716.43 mi (1,152.99 km) |
| Willoughby to Clarkston (Georgia) | 562.88 mi (905.87 km) |
| Willoughby to Clarksville (Indiana) | 325.48 mi (523.81 km) |
| Willoughby to Clarksville (Tennessee) | 473.27 mi (761.65 km) |
| Willoughby to Clawson (Michigan) | 108.47 mi (174.56 km) |
| Willoughby to Clay (Alabama) | 618.30 mi (995.06 km) |
| Willoughby to Clayton (California) | 2,146.52 mi (3,454.50 km) |
| Willoughby to Clayton (Missouri) | 514.50 mi (828.00 km) |
| Willoughby to Clayton (North Carolina) | 443.31 mi (713.44 km) |
| Willoughby to Clayton (Ohio) | 196.05 mi (315.51 km) |
| Willoughby to Clearfield (Utah) | 1,579.40 mi (2,541.80 km) |
| Willoughby to Clearlake (California) | 2,159.47 mi (3,475.34 km) |
| Willoughby to Clearwater (Florida) | 947.37 mi (1,524.65 km) |
| Willoughby to Cleburne (Texas) | 1,088.84 mi (1,752.31 km) |
| Willoughby to Clemmons (North Carolina) | 391.76 mi (630.48 km) |
