| Duncan to Decatur (Alabama) | 621.70 mi (1,000.53 km) |
| Duncan to Decatur (Georgia) | 780.25 mi (1,255.69 km) |
| Duncan to Decatur (Illinois) | 615.50 mi (990.56 km) |
| Duncan to Deer Park (New York) | 1,407.21 mi (2,264.69 km) |
| Duncan to Deer Park (Texas) | 373.20 mi (600.60 km) |
| Duncan to Deerfield (Illinois) | 757.41 mi (1,218.93 km) |
| Duncan to Deerfield Beach (Florida) | 1,200.60 mi (1,932.19 km) |
| Duncan to Defiance (Ohio) | 871.90 mi (1,403.19 km) |
| Duncan to DeForest (Wisconsin) | 756.27 mi (1,217.10 km) |
| Duncan to DeKalb (Illinois) | 712.33 mi (1,146.39 km) |
| Duncan to Del Aire (California) | 1,166.91 mi (1,877.96 km) |
| Duncan to Del City (Oklahoma) | 68.35 mi (110.00 km) |
| Duncan to Del Rio (Texas) | 397.03 mi (638.97 km) |
| Duncan to DeLand (Florida) | 1,047.09 mi (1,685.12 km) |
| Duncan to Delano (California) | 1,206.23 mi (1,941.24 km) |
