| Risca to Carson (California) | 5,352.10 mi (8,613.38 km) |
| Risca to Carson City (Nevada) | 5,099.93 mi (8,207.55 km) |
| Risca to Carteret (New Jersey) | 3,352.25 mi (5,394.92 km) |
| Risca to Cartersville (Georgia) | 4,080.20 mi (6,566.44 km) |
| Risca to Carthage (Missouri) | 4,314.12 mi (6,942.90 km) |
| Risca to Cary (Illinois) | 3,839.34 mi (6,178.83 km) |
| Risca to Cary (North Carolina) | 3,756.95 mi (6,046.23 km) |
| Risca to Casa de Oro-Mount Helix (California) | 5,369.60 mi (8,641.53 km) |
| Risca to Casa Grande (Arizona) | 5,181.71 mi (8,339.16 km) |
| Risca to Casas Adobes (Arizona) | 5,185.93 mi (8,345.95 km) |
| Risca to Cascades (Virginia) | 3,549.33 mi (5,712.09 km) |
| Risca to Casper (Wyoming) | 4,464.28 mi (7,184.56 km) |
| Risca to Casselberry (Florida) | 4,204.36 mi (6,766.27 km) |
| Risca to Castaic (California) | 5,328.05 mi (8,574.66 km) |
| Risca to Castle Pines (Colorado) | 4,588.15 mi (7,383.91 km) |
