| Duncan to Marshall (Minnesota) | 693.88 mi (1,116.69 km) |
| Duncan to Marshall (Missouri) | 409.78 mi (659.47 km) |
| Duncan to Marshall (Texas) | 247.84 mi (398.86 km) |
| Duncan to Marshalltown (Iowa) | 584.56 mi (940.75 km) |
| Duncan to Marshfield (Wisconsin) | 811.05 mi (1,305.26 km) |
| Duncan to Martha Lake (Washington) | 1,552.01 mi (2,497.72 km) |
| Duncan to Martin (Tennessee) | 525.25 mi (845.30 km) |
| Duncan to Martinez (California) | 1,364.77 mi (2,196.39 km) |
| Duncan to Martinez (Georgia) | 907.83 mi (1,461.01 km) |
| Duncan to Martinsburg (West Virginia) | 1,148.96 mi (1,849.07 km) |
| Duncan to Martinsville (Indiana) | 717.27 mi (1,154.34 km) |
| Duncan to Martinsville (New Jersey) | 1,340.64 mi (2,157.55 km) |
| Duncan to Martinsville (Virginia) | 1,023.51 mi (1,647.19 km) |
| Duncan to Maryland City (Maryland) | 1,206.60 mi (1,941.83 km) |
| Duncan to Maryland Heights (Missouri) | 503.52 mi (810.34 km) |
