| Holyhead to Cookeville (Tennessee) | 3,915.35 mi (6,301.15 km) |
| Holyhead to Coolidge (Arizona) | 5,052.52 mi (8,131.24 km) |
| Holyhead to Coon Rapids (Minnesota) | 3,776.43 mi (6,077.57 km) |
| Holyhead to Cooper City (Florida) | 4,213.30 mi (6,780.65 km) |
| Holyhead to Coos Bay (Oregon) | 4,860.89 mi (7,822.85 km) |
| Holyhead to Copiague (New York) | 3,221.48 mi (5,184.47 km) |
| Holyhead to Coppell (Texas) | 4,521.29 mi (7,276.31 km) |
| Holyhead to Copperas Cove (Texas) | 4,653.24 mi (7,488.66 km) |
| Holyhead to Coral Gables (Florida) | 4,230.46 mi (6,808.26 km) |
| Holyhead to Coral Springs (Florida) | 4,200.60 mi (6,760.21 km) |
| Holyhead to Coral Terrace (Florida) | 4,229.61 mi (6,806.91 km) |
| Holyhead to Coralville (Iowa) | 3,879.46 mi (6,243.38 km) |
| Holyhead to Coram (New York) | 3,196.64 mi (5,144.50 km) |
| Holyhead to Corcoran (California) | 5,141.21 mi (8,273.98 km) |
| Holyhead to Cordele (Georgia) | 4,053.77 mi (6,523.91 km) |
