| Webster Groves to Cadillac (Michigan) | 467.28 mi (752.01 km) |
| Webster Groves to Caguas (Puerto Rico) | 2,027.44 mi (3,262.85 km) |
| Webster Groves to Cahokia (Illinois) | 9.58 mi (15.41 km) |
| Webster Groves to Calabasas (California) | 1,598.49 mi (2,572.52 km) |
| Webster Groves to Caldwell (Idaho) | 1,406.66 mi (2,263.80 km) |
| Webster Groves to Caledonia (Wisconsin) | 318.63 mi (512.78 km) |
| Webster Groves to Calera (Alabama) | 427.96 mi (688.74 km) |
| Webster Groves to Calexico (California) | 1,464.17 mi (2,356.36 km) |
| Webster Groves to Calhoun (Georgia) | 412.72 mi (664.21 km) |
| Webster Groves to California (Maryland) | 749.59 mi (1,206.34 km) |
| Webster Groves to California City (California) | 1,533.45 mi (2,467.84 km) |
| Webster Groves to Callaway (Florida) | 644.63 mi (1,037.42 km) |
| Webster Groves to Calumet City (Illinois) | 256.28 mi (412.44 km) |
| Webster Groves to Calverton (Maryland) | 721.71 mi (1,161.47 km) |
| Webster Groves to Camano (Washington) | 1,727.91 mi (2,780.81 km) |
