| Duncan to Morristown (New Jersey) | 1,348.21 mi (2,169.73 km) |
| Duncan to Morristown (Tennessee) | 830.92 mi (1,337.23 km) |
| Duncan to Morrisville (North Carolina) | 1,079.76 mi (1,737.71 km) |
| Duncan to Morro Bay (California) | 1,296.69 mi (2,086.81 km) |
| Duncan to Morton (Illinois) | 624.25 mi (1,004.63 km) |
| Duncan to Morton Grove (Illinois) | 754.33 mi (1,213.98 km) |
| Duncan to Moscow (Idaho) | 1,301.47 mi (2,094.51 km) |
| Duncan to Moses Lake (Washington) | 1,407.14 mi (2,264.57 km) |
| Duncan to Moss Bluff (Louisiana) | 401.59 mi (646.30 km) |
| Duncan to Moss Point (Mississippi) | 616.53 mi (992.21 km) |
| Duncan to Moultrie (Georgia) | 853.11 mi (1,372.95 km) |
| Duncan to Mounds View (Minnesota) | 771.36 mi (1,241.38 km) |
| Duncan to Mount Airy (North Carolina) | 981.25 mi (1,579.17 km) |
| Duncan to Mount Clemens (Michigan) | 982.50 mi (1,581.18 km) |
| Duncan to Mount Dora (Florida) | 1,034.58 mi (1,664.99 km) |
