| Porthcawl to Corinth (Mississippi) | 4,171.95 mi (6,714.11 km) |
| Porthcawl to Corinth (Texas) | 4,602.11 mi (7,406.38 km) |
| Porthcawl to Cornelius (North Carolina) | 3,834.36 mi (6,170.80 km) |
| Porthcawl to Cornelius (Oregon) | 4,827.08 mi (7,768.43 km) |
| Porthcawl to Corning (New York) | 3,379.63 mi (5,439.00 km) |
| Porthcawl to Corona (California) | 5,313.38 mi (8,551.06 km) |
| Porthcawl to Coronado (California) | 5,366.79 mi (8,637.02 km) |
| Porthcawl to Corpus Christi (Texas) | 4,893.14 mi (7,874.76 km) |
| Porthcawl to Corsicana (Texas) | 4,632.41 mi (7,455.14 km) |
| Porthcawl to Cortland (New York) | 3,325.02 mi (5,351.10 km) |
| Porthcawl to Corvallis (Oregon) | 4,887.06 mi (7,864.97 km) |
| Porthcawl to Coshocton (Ohio) | 3,655.21 mi (5,882.50 km) |
| Porthcawl to Costa Mesa (California) | 5,336.00 mi (8,587.46 km) |
| Porthcawl to Coto de Caza (California) | 5,328.98 mi (8,576.17 km) |
| Porthcawl to Cottage Grove (Minnesota) | 3,878.09 mi (6,241.18 km) |
