| Duncan to Marysville (California) | 1,342.34 mi (2,160.28 km) |
| Duncan to Marysville (Ohio) | 889.28 mi (1,431.15 km) |
| Duncan to Marysville (Washington) | 1,556.37 mi (2,504.73 km) |
| Duncan to Maryville (Missouri) | 434.34 mi (699.01 km) |
| Duncan to Maryville (Tennessee) | 791.45 mi (1,273.71 km) |
| Duncan to Mason (Ohio) | 821.22 mi (1,321.63 km) |
| Duncan to Mason City (Iowa) | 646.47 mi (1,040.39 km) |
| Duncan to Massapequa (New York) | 1,398.42 mi (2,250.54 km) |
| Duncan to Massapequa Park (New York) | 1,399.67 mi (2,252.55 km) |
| Duncan to Massillon (Ohio) | 992.99 mi (1,598.07 km) |
| Duncan to Mastic (New York) | 1,432.20 mi (2,304.91 km) |
| Duncan to Mastic Beach (New York) | 1,432.28 mi (2,305.03 km) |
| Duncan to Matteson (Illinois) | 732.89 mi (1,179.48 km) |
| Duncan to Matthews (North Carolina) | 975.75 mi (1,570.32 km) |
| Duncan to Mattoon (Illinois) | 627.54 mi (1,009.93 km) |
