| Duncan to Madison (New Jersey) | 1,350.80 mi (2,173.90 km) |
| Duncan to Madison (Wisconsin) | 746.86 mi (1,201.96 km) |
| Duncan to Madison Heights (Michigan) | 969.62 mi (1,560.46 km) |
| Duncan to Madison Heights (Virginia) | 1,068.95 mi (1,720.30 km) |
| Duncan to Madisonville (Kentucky) | 613.65 mi (987.58 km) |
| Duncan to Magalia (California) | 1,349.48 mi (2,171.78 km) |
| Duncan to Magna (Utah) | 888.08 mi (1,429.23 km) |
| Duncan to Magnolia (Arkansas) | 283.00 mi (455.45 km) |
| Duncan to Maili (Hawaii) | 3,732.18 mi (6,006.37 km) |
| Duncan to Maitland (Florida) | 1,054.53 mi (1,697.10 km) |
| Duncan to Makakilo (Hawaii) | 3,728.89 mi (6,001.07 km) |
| Duncan to Malden (Massachusetts) | 1,543.78 mi (2,484.48 km) |
| Duncan to Malibu (California) | 1,189.33 mi (1,914.05 km) |
| Duncan to Maltby (Washington) | 1,545.29 mi (2,486.90 km) |
| Duncan to Malvern (Arkansas) | 290.81 mi (468.01 km) |
