| Duncan to Mountain Brook (Alabama) | 644.17 mi (1,036.69 km) |
| Duncan to Mountain Home (Arkansas) | 335.40 mi (539.78 km) |
| Duncan to Mountain Home (Idaho) | 1,122.34 mi (1,806.23 km) |
| Duncan to Mountain House (California) | 1,332.94 mi (2,145.17 km) |
| Duncan to Mountain Park (Georgia) | 788.96 mi (1,269.70 km) |
| Duncan to Mountain Top (Pennsylvania) | 1,280.51 mi (2,060.79 km) |
| Duncan to Mountain View (California) | 1,361.44 mi (2,191.03 km) |
| Duncan to Mountlake Terrace (Washington) | 1,553.33 mi (2,499.85 km) |
| Duncan to Mukilteo (Washington) | 1,556.89 mi (2,505.57 km) |
| Duncan to Muncie (Indiana) | 790.06 mi (1,271.49 km) |
| Duncan to Mundelein (Illinois) | 756.03 mi (1,216.72 km) |
| Duncan to Munhall (Pennsylvania) | 1,065.29 mi (1,714.42 km) |
| Duncan to Munster (Indiana) | 744.43 mi (1,198.04 km) |
| Duncan to Murfreesboro (Tennessee) | 655.71 mi (1,055.27 km) |
| Duncan to Murphy (Texas) | 129.34 mi (208.15 km) |
