| Duncan to Channelview (Texas) | 366.88 mi (590.44 km) |
| Duncan to Chantilly (Virginia) | 1,170.40 mi (1,883.57 km) |
| Duncan to Chaparral (New Mexico) | 519.28 mi (835.69 km) |
| Duncan to Chapel Hill (North Carolina) | 1,068.26 mi (1,719.20 km) |
| Duncan to Charleston (Illinois) | 636.31 mi (1,024.04 km) |
| Duncan to Charleston (South Carolina) | 1,037.69 mi (1,670.00 km) |
| Duncan to Charleston (West Virginia) | 941.36 mi (1,514.97 km) |
| Duncan to Charlotte (North Carolina) | 968.71 mi (1,558.99 km) |
| Duncan to Charlottesville (Virginia) | 1,106.85 mi (1,781.30 km) |
| Duncan to Chaska (Minnesota) | 745.79 mi (1,200.24 km) |
| Duncan to Chatham (Illinois) | 575.17 mi (925.64 km) |
| Duncan to Chattanooga (Tennessee) | 719.44 mi (1,157.82 km) |
| Duncan to Cheat Lake (West Virginia) | 1,054.33 mi (1,696.78 km) |
| Duncan to Chelsea (Alabama) | 652.36 mi (1,049.87 km) |
| Duncan to Chelsea (Massachusetts) | 1,544.55 mi (2,485.72 km) |
