| Duncan to Manor (Texas) | 290.06 mi (466.81 km) |
| Duncan to Manorville (New York) | 1,435.66 mi (2,310.47 km) |
| Duncan to Mansfield (Ohio) | 943.69 mi (1,518.73 km) |
| Duncan to Mansfield (Texas) | 143.82 mi (231.45 km) |
| Duncan to Manteca (California) | 1,315.65 mi (2,117.33 km) |
| Duncan to Manville (New Jersey) | 1,339.13 mi (2,155.13 km) |
| Duncan to Maple Grove (Minnesota) | 767.24 mi (1,234.75 km) |
| Duncan to Maple Heights (Ohio) | 1,007.14 mi (1,620.84 km) |
| Duncan to Maple Valley (Washington) | 1,528.74 mi (2,460.26 km) |
| Duncan to Mapleton (Utah) | 841.99 mi (1,355.06 km) |
| Duncan to Maplewood (Minnesota) | 766.62 mi (1,233.76 km) |
| Duncan to Marana (Arizona) | 775.75 mi (1,248.45 km) |
| Duncan to Marco Island (Florida) | 1,134.13 mi (1,825.21 km) |
| Duncan to Margate (Florida) | 1,198.39 mi (1,928.63 km) |
| Duncan to Maricopa (Arizona) | 814.41 mi (1,310.66 km) |
