| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Fort Mackinac | city | Michigan | United States | 45.85 | -84.62 | 830 | |
| Fort Madison | city | Iowa | United States | 40.63 | -91.32 | 830 | |
| Fort Magruder Heights | city | Virginia | United States | 37.26 | -76.68 | 49 | |
| Fort Martin | city | West Virginia | United States | 39.71 | -79.95 | 1099 | |
| Fort Mason | city | Florida | United States | 28.88 | -81.70 | 65 | |
| Fort Matanzas | city | Florida | United States | 29.71 | -81.24 | 3 | |
| Fort McAllister | city | Georgia | United States | 31.89 | -81.20 | 3 | |
| Fort McCoy | city | Florida | United States | 29.36 | -81.97 | 91 | |
| Fort McDermott | city | Alabama | United States | 30.67 | -87.92 | 108 | |
| Fort McDonald | city | Arizona | United States | 34.24 | -111.35 | 5029 | |
| Fort McDowell | city | Arizona | United States | 33.64 | -111.67 | 1669 | |
| Fort McDowell | city | California | United States | 37.86 | -122.42 | 52 | |
| Fort McIntosh | city | Texas | United States | 27.51 | -99.52 | 377 | |
| Fort McKavett | city | Texas | United States | 30.83 | -100.11 | 2509 | |
| Fort McKinley | city | Ohio | United States | 39.80 | -84.25 | 954 | |
| Fort McPherson | city | Georgia | United States | 33.71 | -84.43 | 1043 | |
| Fort Meade | city | Florida | United States | 27.75 | -81.80 | 118 | |
| Fort Meade Mobile Home Park | city | Florida | United States | 27.75 | -81.79 | 88 | |
| Fort Meigs Place | city | Ohio | United States | 41.54 | -83.65 | 830 | |
| Fort Mill | city | South Carolina | United States | 35.01 | -80.95 | 830 | |
| Fort Miller | city | New York | United States | 43.16 | -73.58 | 190 | |
| Fort Miller (historical) | city | California | United States | 37.02 | -119.66 | 830 | |
| Fort Misery | city | Arizona | United States | 34.14 | -112.37 | 4429 | |
| Fort Mitchell | city | Alabama | United States | 32.34 | -85.02 | 347 | |
| Fort Mitchell | city | Kentucky | United States | 39.06 | -84.55 | 830 | |
| Fort Mitchell | city | Virginia | United States | 36.92 | -78.49 | 830 | |
| Fort Montgomery | city | New York | United States | 41.33 | -73.99 | 3 | |
| Fort Morgan | city | Alabama | United States | 30.23 | -88.02 | 0 | |
| Fort Morgan | city | Colorado | United States | 40.25 | -103.80 | 4320 | |
| Fort Morris | city | Massachusetts | United States | 42.65 | -72.68 | 1145 | |
| Fort Morrison | city | Massachusetts | United States | 42.70 | -72.70 | 830 | |
| Fort Motte | city | South Carolina | United States | 33.74 | -80.69 | 170 | |
| Fort Moultrie | city | South Carolina | United States | 32.76 | -79.86 | 0 | |
| Fort Mountain (historical) | city | Georgia | United States | 34.77 | -84.75 | 938 | |
| Fort Mudge | city | Georgia | United States | 31.06 | -82.19 | 141 | |
| Fort Myer Heights | city | Virginia | United States | 38.89 | -77.08 | 193 | |
| Fort Myers | city | Florida | United States | 26.64 | -81.87 | 6 | |
| Fort Myers Beach | city | Florida | United States | 26.45 | -81.95 | 0 | |
| Fort Myers Shores | city | Florida | United States | 26.71 | -81.75 | 6 | |
| Fort Myers Villas | city | Florida | United States | 26.56 | -81.86 | 6 |