| Glen Carbon to Clarksdale (Mississippi) | 317.07 mi (510.28 km) |
| Glen Carbon to Clarkston (Georgia) | 467.84 mi (752.91 km) |
| Glen Carbon to Clarksville (Indiana) | 229.75 mi (369.74 km) |
| Glen Carbon to Clarksville (Tennessee) | 209.11 mi (336.53 km) |
| Glen Carbon to Clawson (Michigan) | 442.97 mi (712.89 km) |
| Glen Carbon to Clay (Alabama) | 397.06 mi (639.00 km) |
| Glen Carbon to Clayton (California) | 1,723.23 mi (2,773.26 km) |
| Glen Carbon to Clayton (Missouri) | 20.35 mi (32.74 km) |
| Glen Carbon to Clayton (North Carolina) | 669.19 mi (1,076.96 km) |
| Glen Carbon to Clayton (Ohio) | 311.73 mi (501.67 km) |
| Glen Carbon to Clearfield (Utah) | 1,175.79 mi (1,892.25 km) |
| Glen Carbon to Clearlake (California) | 1,747.23 mi (2,811.90 km) |
| Glen Carbon to Clearwater (Florida) | 852.63 mi (1,372.18 km) |
| Glen Carbon to Cleburne (Texas) | 607.97 mi (978.43 km) |
| Glen Carbon to Clemmons (North Carolina) | 559.07 mi (899.74 km) |
