| Duncan to Miami Lakes (Florida) | 1,205.39 mi (1,939.89 km) |
| Duncan to Miami Shores (Florida) | 1,214.55 mi (1,954.64 km) |
| Duncan to Miami Springs (Florida) | 1,210.63 mi (1,948.32 km) |
| Duncan to Miamisburg (Ohio) | 829.29 mi (1,334.62 km) |
| Duncan to Michigan City (Indiana) | 777.45 mi (1,251.19 km) |
| Duncan to Middle Island (New York) | 1,428.06 mi (2,298.24 km) |
| Duncan to Middle River (Maryland) | 1,229.23 mi (1,978.26 km) |
| Duncan to Middle Valley (Tennessee) | 722.32 mi (1,162.47 km) |
| Duncan to Middleburg (Florida) | 984.44 mi (1,584.30 km) |
| Duncan to Middleburg Heights (Ohio) | 994.02 mi (1,599.72 km) |
| Duncan to Middlesex (New Jersey) | 1,344.09 mi (2,163.10 km) |
| Duncan to Middleton (Wisconsin) | 744.45 mi (1,198.07 km) |
| Duncan to Middletown (Connecticut) | 1,451.25 mi (2,335.56 km) |
| Duncan to Middletown (Delaware) | 1,267.61 mi (2,040.02 km) |
| Duncan to Middletown (New York) | 1,360.27 mi (2,189.14 km) |
