| Holyhead to Carson (California) | 5,227.75 mi (8,413.25 km) |
| Holyhead to Carson City (Nevada) | 4,972.23 mi (8,002.03 km) |
| Holyhead to Carteret (New Jersey) | 3,258.84 mi (5,244.59 km) |
| Holyhead to Cartersville (Georgia) | 3,984.92 mi (6,413.12 km) |
| Holyhead to Carthage (Missouri) | 4,205.51 mi (6,768.12 km) |
| Holyhead to Cary (Illinois) | 3,730.14 mi (6,003.07 km) |
| Holyhead to Cary (North Carolina) | 3,666.26 mi (5,900.28 km) |
| Holyhead to Casa de Oro-Mount Helix (California) | 5,246.65 mi (8,443.66 km) |
| Holyhead to Casa Grande (Arizona) | 5,062.35 mi (8,147.07 km) |
| Holyhead to Casas Adobes (Arizona) | 5,067.53 mi (8,155.40 km) |
| Holyhead to Cascades (Virginia) | 3,455.06 mi (5,560.39 km) |
| Holyhead to Casper (Wyoming) | 4,341.70 mi (6,987.30 km) |
| Holyhead to Casselberry (Florida) | 4,121.21 mi (6,632.44 km) |
| Holyhead to Castaic (California) | 5,203.13 mi (8,373.64 km) |
| Holyhead to Castle Pines (Colorado) | 4,469.01 mi (7,192.18 km) |
