| Boppard to Caguas (Puerto Rico) | 4,538.54 mi (7,304.07 km) |
| Boppard to Cahokia (Illinois) | 4,539.29 mi (7,305.29 km) |
| Boppard to Calabasas (California) | 5,749.41 mi (9,252.78 km) |
| Boppard to Caldwell (Idaho) | 5,136.17 mi (8,265.86 km) |
| Boppard to Caledonia (Wisconsin) | 4,247.66 mi (6,835.94 km) |
| Boppard to Calera (Alabama) | 4,677.27 mi (7,527.34 km) |
| Boppard to Calexico (California) | 5,737.52 mi (9,233.64 km) |
| Boppard to Calhoun (Georgia) | 4,537.36 mi (7,302.17 km) |
| Boppard to California (Maryland) | 4,015.99 mi (6,463.11 km) |
| Boppard to California City (California) | 5,665.64 mi (9,117.96 km) |
| Boppard to Callaway (Florida) | 4,779.57 mi (7,691.97 km) |
| Boppard to Calumet City (Illinois) | 4,292.20 mi (6,907.63 km) |
| Boppard to Calverton (Maryland) | 3,999.62 mi (6,436.77 km) |
| Boppard to Camano (Washington) | 5,018.89 mi (8,077.12 km) |
| Boppard to Camarillo (California) | 5,755.11 mi (9,261.96 km) |
