| Risca to Caguas (Puerto Rico) | 4,083.67 mi (6,572.03 km) |
| Risca to Cahokia (Illinois) | 4,084.63 mi (6,573.58 km) |
| Risca to Calabasas (California) | 5,348.74 mi (8,607.97 km) |
| Risca to Caldwell (Idaho) | 4,755.13 mi (7,652.64 km) |
| Risca to Caledonia (Wisconsin) | 3,798.40 mi (6,112.93 km) |
| Risca to Calera (Alabama) | 4,210.19 mi (6,775.64 km) |
| Risca to Calexico (California) | 5,323.88 mi (8,567.95 km) |
| Risca to Calhoun (Georgia) | 4,070.11 mi (6,550.20 km) |
| Risca to California (Maryland) | 3,545.98 mi (5,706.70 km) |
| Risca to California City (California) | 5,265.03 mi (8,473.25 km) |
| Risca to Callaway (Florida) | 4,308.67 mi (6,934.14 km) |
| Risca to Calumet City (Illinois) | 3,839.80 mi (6,179.57 km) |
| Risca to Calverton (Maryland) | 3,530.80 mi (5,682.27 km) |
| Risca to Camano (Washington) | 4,670.86 mi (7,517.03 km) |
| Risca to Camarillo (California) | 5,355.79 mi (8,619.32 km) |
