| Willoughby to Carrollwood (Florida) | 940.92 mi (1,514.27 km) |
| Willoughby to Carson (California) | 2,067.18 mi (3,326.80 km) |
| Willoughby to Carson City (Nevada) | 2,008.06 mi (3,231.66 km) |
| Willoughby to Carteret (New Jersey) | 380.75 mi (612.75 km) |
| Willoughby to Cartersville (Georgia) | 548.88 mi (883.34 km) |
| Willoughby to Carthage (Missouri) | 755.22 mi (1,215.41 km) |
| Willoughby to Cary (Illinois) | 353.73 mi (569.27 km) |
| Willoughby to Cary (North Carolina) | 428.47 mi (689.56 km) |
| Willoughby to Casa de Oro-Mount Helix (California) | 2,034.54 mi (3,274.27 km) |
| Willoughby to Casa Grande (Arizona) | 1,763.67 mi (2,838.35 km) |
| Willoughby to Casas Adobes (Arizona) | 1,744.78 mi (2,807.95 km) |
| Willoughby to Cascades (Virginia) | 277.60 mi (446.75 km) |
| Willoughby to Casper (Wyoming) | 1,272.27 mi (2,047.52 km) |
| Willoughby to Casselberry (Florida) | 897.09 mi (1,443.72 km) |
| Willoughby to Castaic (California) | 2,067.38 mi (3,327.12 km) |
