| Duncan to Clarksdale (Mississippi) | 419.91 mi (675.77 km) |
| Duncan to Clarkston (Georgia) | 783.06 mi (1,260.22 km) |
| Duncan to Clarksville (Indiana) | 723.69 mi (1,164.66 km) |
| Duncan to Clarksville (Tennessee) | 610.66 mi (982.77 km) |
| Duncan to Clawson (Michigan) | 968.55 mi (1,558.74 km) |
| Duncan to Clay (Alabama) | 649.38 mi (1,045.07 km) |
| Duncan to Clayton (California) | 1,354.47 mi (2,179.81 km) |
| Duncan to Clayton (Missouri) | 507.38 mi (816.55 km) |
| Duncan to Clayton (North Carolina) | 1,101.62 mi (1,772.88 km) |
| Duncan to Clayton (Ohio) | 832.45 mi (1,339.69 km) |
| Duncan to Clearfield (Utah) | 891.65 mi (1,434.97 km) |
| Duncan to Clearlake (California) | 1,397.07 mi (2,248.37 km) |
| Duncan to Clearwater (Florida) | 1,002.03 mi (1,612.62 km) |
| Duncan to Cleburne (Texas) | 153.70 mi (247.35 km) |
| Duncan to Clemmons (North Carolina) | 992.98 mi (1,598.04 km) |
