| Duncan to Manassas (Virginia) | 1,166.96 mi (1,878.04 km) |
| Duncan to Manassas Park (Virginia) | 1,169.37 mi (1,881.91 km) |
| Duncan to Manatí (Puerto Rico) | 2,226.29 mi (3,582.88 km) |
| Duncan to Manchester (Missouri) | 497.07 mi (799.95 km) |
| Duncan to Manchester (New Hampshire) | 1,532.95 mi (2,467.05 km) |
| Duncan to Manchester (Tennessee) | 672.95 mi (1,083.00 km) |
| Duncan to Manchester (Virginia) | 1,154.78 mi (1,858.44 km) |
| Duncan to Mandan (North Dakota) | 862.96 mi (1,388.80 km) |
| Duncan to Mandeville (Louisiana) | 539.43 mi (868.13 km) |
| Duncan to Mango (Florida) | 1,025.57 mi (1,650.50 km) |
| Duncan to Manhattan (Kansas) | 329.27 mi (529.90 km) |
| Duncan to Manhattan (New York) | 1,374.29 mi (2,211.70 km) |
| Duncan to Manhattan Beach (California) | 1,168.73 mi (1,880.89 km) |
| Duncan to Manitowoc (Wisconsin) | 856.35 mi (1,378.16 km) |
| Duncan to Mankato (Minnesota) | 697.75 mi (1,122.93 km) |
