| Risca to Corinth (Mississippi) | 4,193.03 mi (6,748.04 km) |
| Risca to Corinth (Texas) | 4,621.84 mi (7,438.13 km) |
| Risca to Cornelius (North Carolina) | 3,856.75 mi (6,206.85 km) |
| Risca to Cornelius (Oregon) | 4,837.03 mi (7,784.45 km) |
| Risca to Corning (New York) | 3,400.90 mi (5,473.22 km) |
| Risca to Corona (California) | 5,327.83 mi (8,574.31 km) |
| Risca to Coronado (California) | 5,381.64 mi (8,660.91 km) |
| Risca to Corpus Christi (Texas) | 4,914.03 mi (7,908.37 km) |
| Risca to Corsicana (Texas) | 4,652.52 mi (7,487.51 km) |
| Risca to Cortland (New York) | 3,346.30 mi (5,385.34 km) |
| Risca to Corvallis (Oregon) | 4,897.21 mi (7,881.29 km) |
| Risca to Coshocton (Ohio) | 3,676.17 mi (5,916.22 km) |
| Risca to Costa Mesa (California) | 5,350.40 mi (8,610.63 km) |
| Risca to Coto de Caza (California) | 5,343.49 mi (8,599.52 km) |
| Risca to Cottage Grove (Minnesota) | 3,895.43 mi (6,269.09 km) |
