| Duncan to Allison Park (Pennsylvania) | 1,065.89 mi (1,715.39 km) |
| Duncan to Allouez (Wisconsin) | 864.14 mi (1,390.69 km) |
| Duncan to Aloha (Oregon) | 1,512.50 mi (2,434.14 km) |
| Duncan to Alpena (Michigan) | 1,055.47 mi (1,698.61 km) |
| Duncan to Alpharetta (Georgia) | 779.02 mi (1,253.70 km) |
| Duncan to Alpine (California) | 1,087.63 mi (1,750.37 km) |
| Duncan to Alpine (Utah) | 861.04 mi (1,385.70 km) |
| Duncan to Alsip (Illinois) | 740.14 mi (1,191.15 km) |
| Duncan to Altadena (California) | 1,151.13 mi (1,852.56 km) |
| Duncan to Altamont (Oregon) | 1,387.86 mi (2,233.54 km) |
| Duncan to Altamonte Springs (Florida) | 1,052.26 mi (1,693.45 km) |
| Duncan to Alton (Illinois) | 525.05 mi (844.98 km) |
| Duncan to Alton (Texas) | 570.65 mi (918.38 km) |
| Duncan to Altoona (Iowa) | 547.09 mi (880.46 km) |
| Duncan to Altoona (Pennsylvania) | 1,143.34 mi (1,840.03 km) |
