| Duncan to Merrick (New York) | 1,393.95 mi (2,243.35 km) |
| Duncan to Merrifield (Virginia) | 1,181.05 mi (1,900.71 km) |
| Duncan to Merrillville (Indiana) | 749.01 mi (1,205.42 km) |
| Duncan to Merritt Island (Florida) | 1,102.37 mi (1,774.09 km) |
| Duncan to Mesa (Arizona) | 793.82 mi (1,277.52 km) |
| Duncan to Mesquite (Nevada) | 922.10 mi (1,483.97 km) |
| Duncan to Mesquite (Texas) | 145.02 mi (233.38 km) |
| Duncan to Metairie (Louisiana) | 550.33 mi (885.67 km) |
| Duncan to Methuen Town (Massachusetts) | 1,541.67 mi (2,481.08 km) |
| Duncan to Metuchen (New Jersey) | 1,350.83 mi (2,173.95 km) |
| Duncan to Mexico (Missouri) | 462.24 mi (743.90 km) |
| Duncan to Miami (Florida) | 1,216.09 mi (1,957.11 km) |
| Duncan to Miami (Oklahoma) | 235.73 mi (379.37 km) |
| Duncan to Miami Beach (Florida) | 1,218.45 mi (1,960.91 km) |
| Duncan to Miami Gardens (Florida) | 1,208.28 mi (1,944.54 km) |
