| Willoughby to Cullman (Alabama) | 594.63 mi (956.97 km) |
| Willoughby to Culpeper (Virginia) | 283.90 mi (456.88 km) |
| Willoughby to Culver City (California) | 2,069.36 mi (3,330.32 km) |
| Willoughby to Cumberland (Maryland) | 195.65 mi (314.87 km) |
| Willoughby to Cupertino (California) | 2,167.45 mi (3,488.17 km) |
| Willoughby to Cutler Bay (Florida) | 1,111.98 mi (1,789.55 km) |
| Willoughby to Cutlerville (Michigan) | 233.21 mi (375.31 km) |
| Willoughby to Cuyahoga Falls (Ohio) | 33.79 mi (54.39 km) |
| Willoughby to Cypress (California) | 2,056.59 mi (3,309.77 km) |
| Willoughby to Cypress Gardens (Florida) | 942.72 mi (1,517.16 km) |
| Willoughby to Cypress Lake (Florida) | 1,044.15 mi (1,680.39 km) |
| Willoughby to D'Iberville (Mississippi) | 877.38 mi (1,412.00 km) |
| Willoughby to Dakota Ridge (Colorado) | 1,247.94 mi (2,008.37 km) |
| Willoughby to Dale City (Virginia) | 298.19 mi (479.90 km) |
| Willoughby to Dallas (Georgia) | 565.95 mi (910.81 km) |
