| Webster Groves to Castle Pines (Colorado) | 780.68 mi (1,256.39 km) |
| Webster Groves to Castle Rock (Colorado) | 779.81 mi (1,254.98 km) |
| Webster Groves to Castro Valley (California) | 1,715.40 mi (2,760.67 km) |
| Webster Groves to Catalina Foothills (Arizona) | 1,231.05 mi (1,981.19 km) |
| Webster Groves to Cataño (Puerto Rico) | 2,012.20 mi (3,238.32 km) |
| Webster Groves to Cathedral City (California) | 1,486.69 mi (2,392.60 km) |
| Webster Groves to Catonsville (Maryland) | 732.48 mi (1,178.81 km) |
| Webster Groves to Cave Spring (Virginia) | 571.55 mi (919.82 km) |
| Webster Groves to Cayce (South Carolina) | 609.34 mi (980.64 km) |
| Webster Groves to Cayey (Puerto Rico) | 2,028.20 mi (3,264.07 km) |
| Webster Groves to Cedar City (Utah) | 1,234.31 mi (1,986.43 km) |
| Webster Groves to Cedar Falls (Iowa) | 293.21 mi (471.87 km) |
| Webster Groves to Cedar Hill (Texas) | 556.37 mi (895.39 km) |
| Webster Groves to Cedar Lake (Indiana) | 246.55 mi (396.78 km) |
| Webster Groves to Cedar Mill (Oregon) | 1,719.12 mi (2,766.66 km) |
