| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Fort LaClede (historical) | city | Wyoming | United States | 41.42 | -108.39 | 6797 | |
| Fort Lamar | city | Georgia | United States | 34.24 | -83.27 | 830 | |
| Fort Lancaster | city | Texas | United States | 30.67 | -101.70 | 2096 | |
| Fort Landing | city | North Carolina | United States | 35.94 | -76.06 | 3 | |
| Fort Lane | city | Utah | United States | 41.08 | -111.96 | 4445 | |
| Fort Lane Plaza Condominium | city | Utah | United States | 41.05 | -111.96 | 4386 | |
| Fort Laramie | city | Wyoming | United States | 42.21 | -104.52 | 4317 | |
| Fort Lauderdale | city | Florida | United States | 26.12 | -80.14 | 9 | |
| Fort Lawn | city | South Carolina | United States | 34.70 | -80.89 | 830 | |
| Fort Lazy Y Trailer Park | city | Montana | United States | 47.83 | -114.35 | 2890 | |
| Fort Leaton (historical) | city | Texas | United States | 29.54 | -104.32 | 2568 | |
| Fort Lee | city | New Jersey | United States | 40.85 | -73.97 | 249 | |
| Fort Lee | city | Virginia | United States | 37.50 | -77.34 | 111 | |
| Fort Levett | city | Maine | United States | 43.64 | -70.20 | 0 | |
| Fort Lewis | city | Virginia | United States | 38.13 | -79.62 | 1669 | |
| Fort Lewis (historical) | city | Virginia | United States | 38.12 | -79.61 | 1669 | |
| Fort Lewis Terrace | city | Virginia | United States | 37.29 | -80.10 | 1069 | |
| Fort Lincoln New Town | city | District of Columbia | United States | 38.92 | -76.96 | 72 | |
| Fort Littleton | city | Pennsylvania | United States | 40.06 | -77.96 | 830 | |
| Fort Loderdeil | city | Florida | United States | 26.12 | -80.14 | 9 | |
| Fort Loderdeilas | city | Florida | United States | 26.12 | -80.14 | 9 | |
| Fort Logan | city | Montana | United States | 46.68 | -111.17 | 5029 | |
| Fort Lonely | city | Florida | United States | 27.65 | -82.55 | 6 | |
| Fort Lonesome | city | Florida | United States | 27.70 | -82.15 | 114 | |
| Fort Loramie | city | Ohio | United States | 40.35 | -84.37 | 948 | |
| Fort Loring | city | Mississippi | United States | 33.51 | -90.25 | 124 | |
| Fort Loring Landing | city | Mississippi | United States | 33.49 | -90.25 | 108 | |
| Fort Loudon | city | Pennsylvania | United States | 39.91 | -77.90 | 830 | |
| Fort Loudon | city | Tennessee | United States | 35.60 | -84.21 | 830 | |
| Fort Loudon Estates | city | Tennessee | United States | 35.78 | -84.23 | 843 | |
| Fort Lucas | city | Massachusetts | United States | 42.67 | -72.67 | 990 | |
| Fort Lupton | city | Colorado | United States | 40.08 | -104.81 | 5029 | |
| Fort Lynn | city | Arkansas | United States | 33.17 | -93.88 | 229 | |
| Fort Lyon | city | Colorado | United States | 38.09 | -103.15 | 4189 | |
| Fort Lyon | city | Maine | United States | 43.69 | -70.18 | 0 |