| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Duncan | city | Arizona | United States | 32.72 | -109.11 | 4189 | |
| Duncan | city | Arkansas | United States | 34.62 | -91.25 | 173 | |
| Duncan | city | Alabama | United States | 32.97 | -85.90 | 830 | |
| Duncan | city | Alabama | United States | 33.46 | -86.88 | 830 | |
| Duncan | city | Colorado | United States | 37.87 | -105.61 | 8389 | |
| Duncan | city | Illinois | United States | 40.98 | -89.79 | 830 | |
| Duncan | city | Indiana | United States | 38.29 | -85.92 | 898 | |
| Duncan | city | Iowa | United States | 43.10 | -93.71 | 1249 | |
| Duncan | city | Kentucky | United States | 37.85 | -84.99 | 830 | |
| Duncan | city | Kentucky | United States | 37.36 | -84.73 | 1669 | |
| Duncan | city | Mississippi | United States | 34.04 | -90.74 | 147 | |
| Duncan | city | Missouri | United States | 37.28 | -92.69 | 1669 | |
| Duncan | city | Nebraska | United States | 41.39 | -97.49 | 1669 | |
| Duncan | city | North Carolina | United States | 35.56 | -78.87 | 413 | |
| Duncan | city | Oklahoma | United States | 34.50 | -97.96 | 1115 | |
| Duncan | city | Oregon | United States | 45.56 | -118.32 | 2509 | |
| Duncan | city | Pennsylvania | United States | 41.65 | -77.26 | 1801 | |
| Duncan | city | South Carolina | United States | 34.94 | -82.15 | 849 | |
| Duncan | city | Tennessee | United States | 35.80 | -83.96 | 859 | |
| Duncan | city | Virginia | United States | 36.91 | -80.49 | 2575 | |
| Duncan | city | Washington | United States | 47.50 | -117.34 | 2509 | |
| Duncan | city | West Virginia | United States | 38.90 | -81.57 | 928 | |
| Duncan (historical) | city | Montana | United States | 48.20 | -114.30 | 3349 | |
| Duncan Chapel | city | South Carolina | United States | 33.30 | -80.56 | 101 | |
| Duncan Corners | city | California | United States | 34.47 | -117.40 | 3349 | |
| Duncan Crossing | city | Maryland | United States | 38.40 | -75.31 | 29 | |
| Duncan Crossroads | city | Alabama | United States | 34.54 | -85.91 | 1236 | |
| Duncan Estates | city | Utah | United States | 40.95 | -111.88 | 4376 | |
| Duncan Falls | city | Ohio | United States | 39.87 | -81.91 | 830 | |
| Duncan Glen | city | Delaware | United States | 39.74 | -75.65 | 104 | |
| Duncan Groves | city | Florida | United States | 27.92 | -82.24 | 104 | |
| Duncan Hills | city | Tennessee | United States | 35.09 | -85.32 | 830 | |
| Duncan Knoll | city | Massachusetts | United States | 42.21 | -72.55 | 219 | |
| Duncan Mill | city | Virginia | United States | 36.76 | -82.65 | 1669 | |
| Duncan Mills | city | Illinois | United States | 40.34 | -90.19 | 830 | |
| Duncan Padgett Mobile Home Park | city | Florida | United States | 26.81 | -80.66 | 16 | |
| Duncan Place | city | Idaho | United States | 42.04 | -114.81 | 5456 | |
| Duncan Ranch Colony | city | Montana | United States | 46.44 | -110.02 | 4399 | |
| Duncan Ridge (historical) | city | Kentucky | United States | 36.98 | -87.04 | 830 | |
| Duncan Springs | city | California | United States | 38.95 | -123.12 | 1049 | |
| Duncan Township | city | South Carolina | United States | 34.56 | -82.27 | 830 | |
| Duncan Village | city | Delaware | United States | 39.73 | -75.64 | 88 | |
| Duncan Woods | city | Delaware | United States | 39.74 | -75.64 | 82 | |
| Duncannon | city | Pennsylvania | United States | 40.40 | -77.02 | 390 | |
| Duncanon | city | Kentucky | United States | 37.66 | -84.35 | 839 | |
| Duncans Addition | city | Illinois | United States | 41.88 | -87.65 | 830 | |
| Duncans Bridge | city | Missouri | United States | 39.58 | -92.26 | 830 | |
| Duncans Creek | city | North Carolina | United States | 35.45 | -81.72 | 1099 | |
| Duncans Gap (historical) | city | Arkansas | United States | 35.04 | -92.19 | 396 | |
| Duncans Hill | city | Maryland | United States | 39.59 | -76.89 | 830 | |
| Duncans Mills | city | California | United States | 38.45 | -123.06 | 262 | |
| Duncans Mobile Home Park | city | Florida | United States | 27.95 | -82.06 | 101 | |
| Duncans Mobile Home Park | city | Washington | United States | 48.88 | -122.58 | 52 | |
| Duncans Shed (historical) | city | Kentucky | United States | 36.86 | -86.82 | 830 | |
| Duncansville | city | Pennsylvania | United States | 40.42 | -78.43 | 1092 | |
| Duncantown | city | Tennessee | United States | 35.33 | -86.04 | 997 | |
| Duncanville | city | Alabama | United States | 33.06 | -87.44 | 223 | |
| Duncanville | city | Illinois | United States | 38.95 | -87.70 | 830 | |
| Duncanville | city | Tennessee | United States | 35.45 | -86.84 | 905 | |
| Duncanville | city | Texas | United States | 32.65 | -96.91 | 830 | |
| Duncanville | city | Virginia | United States | 36.82 | -81.99 | 1856 | |
| Duncanwood | city | Ohio | United States | 40.20 | -80.95 | 1066 | |
| Dunckley | city | Colorado | United States | 40.30 | -107.19 | 7752 | |
| Duncombe | city | Iowa | United States | 42.47 | -93.99 | 1105 | |
| Duncott | city | Pennsylvania | United States | 40.71 | -76.24 | 898 |