| Duncan to Ashtabula (Ohio) | 1,056.16 mi (1,699.73 km) |
| Duncan to Ashwaubenon (Wisconsin) | 862.50 mi (1,388.07 km) |
| Duncan to Aspen Hill (Maryland) | 1,191.79 mi (1,918.01 km) |
| Duncan to Astoria (Oregon) | 1,571.80 mi (2,529.58 km) |
| Duncan to Atascadero (California) | 1,287.02 mi (2,071.26 km) |
| Duncan to Atascocita (Texas) | 353.19 mi (568.40 km) |
| Duncan to Atchison (Kansas) | 379.37 mi (610.54 km) |
| Duncan to Athens (Alabama) | 623.41 mi (1,003.29 km) |
| Duncan to Athens (Georgia) | 831.45 mi (1,338.09 km) |
| Duncan to Athens (Ohio) | 932.76 mi (1,501.13 km) |
| Duncan to Athens (Tennessee) | 755.80 mi (1,216.34 km) |
| Duncan to Athens (Texas) | 201.48 mi (324.26 km) |
| Duncan to Atlanta (Georgia) | 773.17 mi (1,244.30 km) |
| Duncan to Atlantic Beach (Florida) | 1,004.14 mi (1,616.00 km) |
| Duncan to Atlantic City (New Jersey) | 1,333.92 mi (2,146.74 km) |
