| Duncan to Delaware (Ohio) | 904.73 mi (1,456.02 km) |
| Duncan to Delhi (California) | 1,289.98 mi (2,076.02 km) |
| Duncan to Delray Beach (Florida) | 1,197.01 mi (1,926.40 km) |
| Duncan to Deltona (Florida) | 1,054.63 mi (1,697.27 km) |
| Duncan to Deming (New Mexico) | 588.21 mi (946.63 km) |
| Duncan to Denison (Texas) | 93.45 mi (150.39 km) |
| Duncan to Dent (Ohio) | 799.35 mi (1,286.43 km) |
| Duncan to Denton (Texas) | 101.78 mi (163.80 km) |
| Duncan to Dentsville (South Carolina) | 967.73 mi (1,557.42 km) |
| Duncan to Denver (Colorado) | 525.80 mi (846.20 km) |
| Duncan to Depew (New York) | 1,182.36 mi (1,902.82 km) |
| Duncan to Derby (Connecticut) | 1,426.52 mi (2,295.77 km) |
| Duncan to Derby (Kansas) | 211.70 mi (340.70 km) |
| Duncan to Des Moines (Iowa) | 539.30 mi (867.92 km) |
| Duncan to Des Moines (Washington) | 1,541.20 mi (2,480.32 km) |
