| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Labelle | city | Idaho | United States | 43.70333 | -111.86 | 4881 | 4058 |
| Laclede | city | Idaho | United States | 48.17028 | -116.755 | 2060 | 835 |
| Lacon | city | Idaho | United States | 47.43917 | -116.74417 | 2598 | 270 |
| Lago | city | Idaho | United States | 42.45139 | -111.69583 | 5196 | 350 |
| Lake | city | Idaho | United States | 44.66694 | -111.39278 | 6469 | 28 |
| Lake Fork | city | Idaho | United States | 44.83278 | -116.08389 | 4898 | 266 |
| Lakeshore Summer Home Area | city | Idaho | United States | 44.64611 | -115.66083 | 5836 | 39 |
| Lakeview | city | Idaho | United States | 47.97028 | -116.44556 | 3067 | 205 |
| Lamb Creek | city | Idaho | United States | 48.51639 | -116.92639 | 2598 | 103 |
| Lamont | city | Idaho | United States | 43.96972 | -111.21528 | 6000 | 495 |
| Lanark | city | Idaho | United States | 42.28167 | -111.42778 | 5980 | 224 |
| Landmark | city | Idaho | United States | 44.65639 | -115.54417 | 6791 | 33 |
| Landore | city | Idaho | United States | 45.12333 | -116.6275 | 6194 | 103 |
| Lane | city | Idaho | United States | 47.50694 | -116.53528 | 2250 | 252 |
| Lapwai | city | Idaho | United States | 46.405 | -116.80389 | 1236 | 464 |
| Larson | city | Idaho | United States | 47.47083 | -115.74556 | 3904 | 70 |
| Last Chance | city | Idaho | United States | 44.36667 | -111.40139 | 6174 | 19 |
| Lava Hot Springs | city | Idaho | United States | 42.61944 | -112.01028 | 5997 | 322 |
| Lawman Ford | city | Idaho | United States | 45.11 | -115.60889 | 4035 | 135 |
| Leadore | city | Idaho | United States | 44.68028 | -113.35722 | 5974 | 47 |
| Leadville | city | Idaho | United States | 44.70583 | -113.30722 | 6414 | 47 |
| Leduc historical | city | Idaho | United States | 43.32917 | -114.065 | 5098 | 98 |
| Leesburg | city | Idaho | United States | 45.22389 | -114.11306 | 6673 | 56 |
| Leland | city | Idaho | United States | 46.57806 | -116.60583 | 2362 | 335 |
| Lemhi | city | Idaho | United States | 44.85167 | -113.61889 | 5259 | 47 |
| Len Landing | city | Idaho | United States | 47.52917 | -116.83833 | 2132 | 763 |
| Lenore | city | Idaho | United States | 46.50861 | -116.55 | 1095 | 375 |
| Lenville | city | Idaho | United States | 46.63833 | -116.83944 | 2398 | 1746 |
| Leon | city | Idaho | United States | 46.53194 | -117.03917 | 2598 | 1377 |
| Leone | city | Idaho | United States | 43.40778 | -116.09278 | 3274 | 449 |
| Leonia | city | Idaho | United States | 48.61667 | -116.04861 | 1797 | 211 |
| Leprouse | city | Idaho | United States | 45.74361 | -115.38944 | 4399 | 14 |
| Leslie | city | Idaho | United States | 43.86583 | -113.46667 | 5705 | 56 |
| Letha | city | Idaho | United States | 43.89444 | -116.64667 | 2299 | 1684 |
| Level historical | city | Idaho | United States | 43.89583 | -112.49111 | 4790 | 187 |
| Lewiston | city | Idaho | United States | 46.41667 | -117.01667 | 820 | 21255 |
| Lewiston Orchards | city | Idaho | United States | 46.38056 | -116.97444 | 1502 | 23645 |
| Lewisville | city | Idaho | United States | 43.69583 | -112.00972 | 4799 | 3622 |
| Liberty | city | Idaho | United States | 43.16889 | -112.55444 | 4445 | 1112 |
| Liberty | city | Idaho | United States | 42.31722 | -111.45139 | 5990 | 224 |
| Lidy Hot Springs | city | Idaho | United States | 44.12639 | -112.54889 | 4993 | 19 |
| Lidyville historical | city | Idaho | United States | 46.59556 | -116.80028 | 2404 | 549 |
| Lifton | city | Idaho | United States | 42.12333 | -111.3125 | 5921 | 281 |
| Lightfoot | city | Idaho | United States | 45.71861 | -115.36 | 4399 | 14 |
| Lignite | city | Idaho | United States | 48.22889 | -116.54 | 2198 | 3964 |
| Lincoln | city | Idaho | United States | 43.51306 | -111.96361 | 4760 | 35409 |
| Linden | city | Idaho | United States | 46.67083 | -116.49722 | 2946 | 448 |
| Lindsayville | city | Idaho | United States | 42.43 | -111.42139 | 5997 | 216 |
| Linfor | city | Idaho | United States | 47.60833 | -116.23472 | 2286 | 397 |
| Little Rock | city | Idaho | United States | 43.91694 | -116.69278 | 2299 | 1360 |
| Little Sugar Loaf | city | Idaho | United States | 43.09611 | -116.70361 | 5787 | 19 |
| Lodi historical | city | Idaho | United States | 44.08972 | -111.46056 | 5223 | 204 |
| Lone Pine | city | Idaho | United States | 44.18611 | -112.93417 | 6145 | 25 |
| Lone Rock | city | Idaho | United States | 42.7675 | -112.82028 | 4799 | 476 |
| Long Creek Summit Home | city | Idaho | United States | 44.13278 | -115.57722 | 5390 | 61 |
| Lorenzo | city | Idaho | United States | 43.72833 | -111.87056 | 4868 | 3213 |
| Lost River | city | Idaho | United States | 43.68917 | -113.37056 | 5446 | 56 |
| Lotus | city | Idaho | United States | 47.23 | -116.61639 | 2398 | 499 |
| Lowell | city | Idaho | United States | 46.14417 | -115.59472 | 1742 | 14 |
| Lower Stanley | city | Idaho | United States | 44.22694 | -114.92778 | 6400 | 14 |
| Lowman | city | Idaho | United States | 44.08361 | -115.61972 | 4019 | 61 |
| Lucile | city | Idaho | United States | 45.53528 | -116.30944 | 1797 | 47 |
| Lund | city | Idaho | United States | 42.64278 | -111.88778 | 5498 | 302 |
| Lyman | city | Idaho | United States | 43.73917 | -111.81694 | 4888 | 2727 |
| Lyondale historical | city | Idaho | United States | 47.60778 | -116.85 | 2129 | 1200 |
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