| Holyhead to Castle Rock (Colorado) | 4,472.94 mi (7,198.50 km) |
| Holyhead to Castro Valley (California) | 5,124.96 mi (8,247.82 km) |
| Holyhead to Catalina Foothills (Arizona) | 5,065.16 mi (8,151.59 km) |
| Holyhead to Cataño (Puerto Rico) | 4,035.08 mi (6,493.83 km) |
| Holyhead to Cathedral City (California) | 5,169.22 mi (8,319.05 km) |
| Holyhead to Catonsville (Maryland) | 3,419.24 mi (5,502.73 km) |
| Holyhead to Cave Spring (Virginia) | 3,645.01 mi (5,866.08 km) |
| Holyhead to Cayce (South Carolina) | 3,845.07 mi (6,188.05 km) |
| Holyhead to Cayey (Puerto Rico) | 4,053.41 mi (6,523.33 km) |
| Holyhead to Cedar City (Utah) | 4,843.22 mi (7,794.40 km) |
| Holyhead to Cedar Falls (Iowa) | 3,871.66 mi (6,230.83 km) |
| Holyhead to Cedar Hill (Texas) | 4,540.08 mi (7,306.55 km) |
| Holyhead to Cedar Lake (Indiana) | 3,739.18 mi (6,017.63 km) |
| Holyhead to Cedar Mill (Oregon) | 4,697.88 mi (7,560.51 km) |
| Holyhead to Cedar Park (Texas) | 4,681.75 mi (7,534.55 km) |
