| Duncan to Duluth (Minnesota) | 897.39 mi (1,444.20 km) |
| Duncan to Dumas (Texas) | 245.78 mi (395.54 km) |
| Duncan to Dumont (New Jersey) | 1,375.04 mi (2,212.92 km) |
| Duncan to Duncanville (Texas) | 143.21 mi (230.48 km) |
| Duncan to Dundalk (Maryland) | 1,224.81 mi (1,971.15 km) |
| Duncan to Dunedin (Florida) | 998.88 mi (1,607.55 km) |
| Duncan to Dunkirk (New York) | 1,141.42 mi (1,836.93 km) |
| Duncan to Dunmore (Pennsylvania) | 1,300.15 mi (2,092.40 km) |
| Duncan to Dunwoody (Georgia) | 777.84 mi (1,251.82 km) |
| Duncan to Durango (Colorado) | 587.83 mi (946.01 km) |
| Duncan to Durant (Oklahoma) | 95.11 mi (153.07 km) |
| Duncan to Durham (North Carolina) | 1,075.90 mi (1,731.49 km) |
| Duncan to Dyer (Indiana) | 742.18 mi (1,194.42 km) |
| Duncan to Dyersburg (Tennessee) | 492.74 mi (792.99 km) |
| Duncan to Eagan (Minnesota) | 753.39 mi (1,212.46 km) |
