Towns
| State | City/Town | Town Title |
|---|---|---|
| Illinois | Le Roy | Le Roy, IL |
| Illinois | Leaf River | Leaf River, IL |
| Illinois | Lebanon | Lebanon, IL |
| Illinois | Lee | Lee, IL |
| Illinois | Lee Center | Lee Center, IL |
| Illinois | Leland | Leland, IL |
| Illinois | Lemmon | Lemmon, IL |
| Illinois | Lemont | Lemont, IL |
| Illinois | Lena | Lena, IL |
| Illinois | Lenzburg | Lenzburg, IL |
| Illinois | Leonore | Leonore, IL |
| Illinois | Lerna | Lerna, IL |
| Illinois | Lewistown | Lewistown, IL |
| Illinois | Lexington | Lexington, IL |
| Illinois | Liberty | Liberty, IL |
| Illinois | Libertyville | Libertyville, IL |
| Illinois | Lima | Lima, IL |
| Illinois | Lincoln | Lincoln, IL |
| Illinois | Lincoln's New Salem | Lincoln's New Salem, IL |
| Illinois | Lincolnshire | Lincolnshire, IL |
| Illinois | Lincolnwood | Lincolnwood, IL |
| Illinois | Lindenwood | Lindenwood, IL |
| Illinois | Lisle | Lisle, IL |
| Illinois | Litchfield | Litchfield, IL |
| Illinois | Literberry | Literberry, IL |