| Duncan to Chicago Ridge (Illinois) | 739.85 mi (1,190.68 km) |
| Duncan to Chickasha (Oklahoma) | 34.58 mi (55.66 km) |
| Duncan to Chico (California) | 1,359.81 mi (2,188.40 km) |
| Duncan to Chicopee (Massachusetts) | 1,464.44 mi (2,356.79 km) |
| Duncan to Chillicothe (Ohio) | 887.14 mi (1,427.72 km) |
| Duncan to Chillum (Maryland) | 1,195.99 mi (1,924.76 km) |
| Duncan to Chino (California) | 1,126.31 mi (1,812.62 km) |
| Duncan to Chino Hills (California) | 1,130.02 mi (1,818.59 km) |
| Duncan to Chino Valley (Arizona) | 823.05 mi (1,324.57 km) |
| Duncan to Chippewa Falls (Wisconsin) | 796.99 mi (1,282.63 km) |
| Duncan to Choctaw (Oklahoma) | 74.74 mi (120.28 km) |
| Duncan to Chowchilla (California) | 1,259.59 mi (2,027.12 km) |
| Duncan to Christiansburg (Virginia) | 995.98 mi (1,602.88 km) |
| Duncan to Chubbuck (Idaho) | 972.30 mi (1,564.77 km) |
| Duncan to Chula Vista (California) | 1,105.22 mi (1,778.69 km) |
