| Willoughby to Castle Pines (Colorado) | 1,237.01 mi (1,990.77 km) |
| Willoughby to Castle Rock (Colorado) | 1,237.64 mi (1,991.78 km) |
| Willoughby to Castro Valley (California) | 2,158.79 mi (3,474.24 km) |
| Willoughby to Catalina Foothills (Arizona) | 1,739.65 mi (2,799.69 km) |
| Willoughby to Cataño (Puerto Rico) | 1,838.64 mi (2,959.01 km) |
| Willoughby to Cathedral City (California) | 1,974.89 mi (3,178.29 km) |
| Willoughby to Catonsville (Maryland) | 295.31 mi (475.25 km) |
| Willoughby to Cave Spring (Virginia) | 314.43 mi (506.03 km) |
| Willoughby to Cayce (South Carolina) | 532.39 mi (856.80 km) |
| Willoughby to Cayey (Puerto Rico) | 1,858.14 mi (2,990.39 km) |
| Willoughby to Cedar City (Utah) | 1,697.65 mi (2,732.11 km) |
| Willoughby to Cedar Falls (Iowa) | 569.19 mi (916.02 km) |
| Willoughby to Cedar Hill (Texas) | 1,058.58 mi (1,703.62 km) |
| Willoughby to Cedar Lake (Indiana) | 312.55 mi (503.00 km) |
| Willoughby to Cedar Mill (Oregon) | 2,065.52 mi (3,324.14 km) |
