| Duncan to Middletown (Ohio) | 821.49 mi (1,322.07 km) |
| Duncan to Midland (Michigan) | 963.62 mi (1,550.79 km) |
| Duncan to Midland (Texas) | 298.10 mi (479.74 km) |
| Duncan to Midlothian (Illinois) | 738.74 mi (1,188.88 km) |
| Duncan to Midlothian (Texas) | 153.03 mi (246.28 km) |
| Duncan to Midlothian (Virginia) | 1,148.60 mi (1,848.49 km) |
| Duncan to Midvale (Utah) | 871.09 mi (1,401.89 km) |
| Duncan to Midway (Florida) | 695.69 mi (1,119.60 km) |
| Duncan to Midwest City (Oklahoma) | 70.93 mi (114.15 km) |
| Duncan to Milford (Delaware) | 1,278.41 mi (2,057.40 km) |
| Duncan to Milford city (Connecticut) | 1,426.26 mi (2,295.34 km) |
| Duncan to Milford Mill (Maryland) | 1,211.22 mi (1,949.27 km) |
| Duncan to Mililani Mauka (Hawaii) | 3,720.21 mi (5,987.09 km) |
| Duncan to Mililani Town (Hawaii) | 3,722.28 mi (5,990.43 km) |
| Duncan to Mill Creek (Washington) | 1,551.30 mi (2,496.58 km) |
