| Porthcawl to Carson (California) | 5,337.84 mi (8,590.43 km) |
| Porthcawl to Carson City (Nevada) | 5,087.40 mi (8,187.39 km) |
| Porthcawl to Carteret (New Jersey) | 3,330.02 mi (5,359.14 km) |
| Porthcawl to Cartersville (Georgia) | 4,058.21 mi (6,531.06 km) |
| Porthcawl to Carthage (Missouri) | 4,294.80 mi (6,911.82 km) |
| Porthcawl to Cary (Illinois) | 3,820.22 mi (6,148.04 km) |
| Porthcawl to Cary (North Carolina) | 3,734.26 mi (6,009.71 km) |
| Porthcawl to Casa de Oro-Mount Helix (California) | 5,354.72 mi (8,617.59 km) |
| Porthcawl to Casa Grande (Arizona) | 5,165.46 mi (8,313.01 km) |
| Porthcawl to Casas Adobes (Arizona) | 5,169.35 mi (8,319.27 km) |
| Porthcawl to Cascades (Virginia) | 3,527.22 mi (5,676.51 km) |
| Porthcawl to Casper (Wyoming) | 4,449.30 mi (7,160.46 km) |
| Porthcawl to Casselberry (Florida) | 4,180.60 mi (6,728.03 km) |
| Porthcawl to Castaic (California) | 5,314.04 mi (8,552.13 km) |
| Porthcawl to Castle Pines (Colorado) | 4,571.86 mi (7,357.69 km) |
