| Duncan to Arcata (California) | 1,488.56 mi (2,395.60 km) |
| Duncan to Archdale (North Carolina) | 1,016.79 mi (1,636.36 km) |
| Duncan to Arden-Arcade (California) | 1,327.95 mi (2,137.13 km) |
| Duncan to Ardmore (Oklahoma) | 51.30 mi (82.56 km) |
| Duncan to Ardmore (Pennsylvania) | 1,295.96 mi (2,085.65 km) |
| Duncan to Arecibo (Puerto Rico) | 2,211.91 mi (3,559.73 km) |
| Duncan to Arkadelphia (Arkansas) | 278.10 mi (447.55 km) |
| Duncan to Arkansas City (Kansas) | 181.79 mi (292.56 km) |
| Duncan to Arlington (Tennessee) | 470.19 mi (756.70 km) |
| Duncan to Arlington (Texas) | 135.20 mi (217.59 km) |
| Duncan to Arlington (Virginia) | 1,188.63 mi (1,912.92 km) |
| Duncan to Arlington (Washington) | 1,558.79 mi (2,508.63 km) |
| Duncan to Arlington Heights (Illinois) | 749.17 mi (1,205.67 km) |
| Duncan to Arnold (Maryland) | 1,222.35 mi (1,967.18 km) |
| Duncan to Arnold (Missouri) | 497.75 mi (801.05 km) |
