| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Liberty | city | Illinois | United States | 37.72 | -88.57 | 396 | |
| Liberty | city | Illinois | United States | 39.88 | -91.11 | 830 | |
| Liberty Grove | city | Illinois | United States | 41.61 | -88.23 | 830 | |
| Liberty Hill | city | Illinois | United States | 39.20 | -88.15 | 830 | |
| Libertyville | city | Illinois | United States | 42.28 | -87.95 | 830 | |
| Lick Creek | city | Illinois | United States | 37.52 | -89.08 | 830 | |
| Lidice | city | Illinois | United States | 41.55 | -88.09 | 830 | |
| Lightsville | city | Illinois | United States | 42.15 | -89.40 | 830 | |
| Lilly | city | Illinois | United States | 40.54 | -89.29 | 830 | |
| Lillyville | city | Illinois | United States | 39.19 | -88.45 | 830 | |
| Lily Cache | city | Illinois | United States | 41.59 | -88.18 | 830 | |
| Lily Lake | city | Illinois | United States | 41.95 | -88.48 | 944 | |
| Lilydale | city | Illinois | United States | 41.72 | -87.63 | 830 | |
| Lilymoor | city | Illinois | United States | 42.33 | -88.21 | 830 | |
| Lima | city | Illinois | United States | 40.18 | -91.38 | 830 | |
| Limerick | city | Illinois | United States | 41.49 | -89.47 | 830 | |
| Limestone | city | Illinois | United States | 41.13 | -87.97 | 830 | |
| Lincoln | city | Illinois | United States | 40.15 | -89.36 | 830 | |
| Lincoln Estates | city | Illinois | United States | 41.50 | -87.81 | 830 | |
| Lincoln Heights | city | Illinois | United States | 41.86 | -89.52 | 830 | |
| Lincoln Hills | city | Illinois | United States | 39.93 | -91.37 | 830 | |
| Lincoln Park | city | Illinois | United States | 41.92 | -87.65 | 830 | |
| Lincoln Square (historical) | city | Illinois | United States | 41.98 | -87.69 | 830 | |
| Lincolnshire | city | Illinois | United States | 42.19 | -87.91 | 830 | |
| Lincolnshire | city | Illinois | United States | 41.47 | -87.61 | 830 | |
| Lincolnwood | city | Illinois | United States | 42.00 | -87.73 | 830 | |
| Lincolnwood Hills | city | Illinois | United States | 41.51 | -87.91 | 830 | |
| Lindberg Park | city | Illinois | United States | 42.23 | -89.06 | 830 | |
| Linden Ridge | city | Illinois | United States | 42.13 | -87.82 | 830 | |
| Lindenhurst | city | Illinois | United States | 42.41 | -88.03 | 830 | |
| Lindenwood | city | Illinois | United States | 42.05 | -89.03 | 830 | |
| Lindskolds Subdivision | city | Illinois | United States | 42.21 | -89.14 | 830 | |
| Lintner | city | Illinois | United States | 39.80 | -88.67 | 830 | |
| Linview | city | Illinois | United States | 42.21 | -89.05 | 830 | |
| Lipsey | city | Illinois | United States | 39.49 | -88.42 | 830 | |
| Lis | city | Illinois | United States | 39.02 | -88.26 | 830 | |
| Lisbon | city | Illinois | United States | 41.48 | -88.48 | 830 | |
| Lisbon Center | city | Illinois | United States | 41.52 | -88.43 | 830 | |
| Lisbon North | city | Illinois | United States | 41.39 | -88.44 | 830 | |
| Lisle | city | Illinois | United States | 41.80 | -88.07 | 830 | |
| Litchfield | city | Illinois | United States | 39.18 | -89.65 | 830 | |
| Litchfield | city | Illinois | United States | 41.16 | -87.59 | 830 | |
| Literberry | city | Illinois | United States | 39.85 | -90.20 | 830 | |
| Lithia | city | Illinois | United States | 39.43 | -88.72 | 830 | |
| Little America | city | Illinois | United States | 40.41 | -90.03 | 830 | |
| Little Hell | city | Illinois | United States | 41.90 | -87.64 | 830 | |
| Little Indian | city | Illinois | United States | 39.89 | -90.20 | 830 | |
| Little Ireland (historical) | city | Illinois | United States | 40.49 | -90.72 | 830 | |
| Little Oklahoma | city | Illinois | United States | 41.86 | -90.15 | 830 | |
| Little Orchard Subdivision | city | Illinois | United States | 42.13 | -87.79 | 830 | |
| Little Rock | city | Illinois | United States | 41.72 | -88.58 | 830 | |
| Little Rock (historical) | city | Illinois | United States | 41.32 | -89.05 | 830 | |
| Little Sicily | city | Illinois | United States | 41.90 | -87.64 | 830 | |
| Little York | city | Illinois | United States | 41.01 | -90.75 | 830 | |
| Littleton | city | Illinois | United States | 40.23 | -90.62 | 830 | |
| Littleville (historical) | city | Illinois | United States | 40.34 | -88.96 | 830 | |
| Lively Grove | city | Illinois | United States | 38.31 | -89.61 | 830 | |
| Liverpool | city | Illinois | United States | 40.39 | -90.00 | 830 | |
| Livingston | city | Illinois | United States | 38.97 | -89.76 | 830 | |
| Livingston | city | Illinois | United States | 39.41 | -87.65 | 830 |