| Duncan to Mineral Wells (Texas) | 119.45 mi (192.23 km) |
| Duncan to Minneapolis (Minnesota) | 761.04 mi (1,224.77 km) |
| Duncan to Minnehaha (Washington) | 1,505.39 mi (2,422.68 km) |
| Duncan to Minneola (Florida) | 1,035.80 mi (1,666.96 km) |
| Duncan to Minnetonka (Minnesota) | 755.78 mi (1,216.31 km) |
| Duncan to Minooka (Illinois) | 708.80 mi (1,140.70 km) |
| Duncan to Minot (North Dakota) | 961.96 mi (1,548.12 km) |
| Duncan to Mint Hill (North Carolina) | 978.81 mi (1,575.24 km) |
| Duncan to Miramar (Florida) | 1,202.20 mi (1,934.75 km) |
| Duncan to Mishawaka (Indiana) | 805.78 mi (1,296.78 km) |
| Duncan to Mission (Texas) | 576.53 mi (927.83 km) |
| Duncan to Mission Bend (Texas) | 359.87 mi (579.16 km) |
| Duncan to Mission Viejo (California) | 1,129.40 mi (1,817.59 km) |
| Duncan to Missoula (Montana) | 1,194.35 mi (1,922.12 km) |
| Duncan to Missouri City (Texas) | 371.17 mi (597.35 km) |
