Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Lick Branch | Stream | | Clark | 39 21 22 N | 087 36 15 W |
| Lick Branch | Stream | | Macoupin | 39 12 11 N | 089 57 24 W |
| Lick Branch | Stream | | Madison | 38 56 43 N | 090 06 53 W |
| Lick Branch | Stream | | Marion | 38 28 42 N | 088 43 05 W |
| Lick Branch | Stream | | Morgan | 39 49 10 N | 090 18 46 W |
| Lick Branch | Stream | | Randolph | 38 03 47 N | 089 38 50 W |
| Lick Creek | Populated Place | 151 | Union | 37 31 21 N | 089 04 30 W |
| Lick Creek | Stream | | Fayette | 38 55 31 N | 089 14 02 W |
| Lick Creek | Stream | | Greene | 39 29 16 N | 090 15 12 W |
| Lick Creek | Stream | | Hamilton | 38 01 53 N | 088 26 51 W |
| Lick Creek | Stream | | Jasper | 39 04 18 N | 088 11 17 W |
| Lick Creek | Stream | | Johnson | 37 28 03 N | 089 01 08 W |
| Lick Creek | Stream | | Macoupin | 39 18 19 N | 090 04 52 W |
| Lick Creek | Stream | | Sangamon | 39 42 25 N | 089 41 11 W |
| Lick Creek | Stream | | Shelby | 39 27 42 N | 088 41 32 W |
| Lick Creek | Stream | | Tazewell | 40 37 02 N | 089 38 26 W |
| Lick Creek | Stream | | Vermilion | 40 06 33 N | 087 36 00 W |
| Lick Creek | Stream | | Wayne | 38 27 13 N | 088 14 27 W |
| Lick Creek | Stream | | White | 37 59 20 N | 088 11 40 W |
| Lick Creek Church | Church | 117 | Hamilton | 38 02 21 N | 088 25 34 W |
| Lick Creek Church | Church | 185 | Union | 37 32 22 N | 089 03 40 W |
| Lick Creek Drain | Canal | 115 | Hamilton | 38 02 06 N | 088 26 12 W |
| Lick Creek Election Precinct | Civil | 200 | Union | 37 32 12 N | 089 04 47 W |
| Lick Creek Elementary School | School | 167 | Union | 37 30 08 N | 089 06 17 W |
| Lick Creek Lateral | Canal | 117 | Wayne | 38 26 43 N | 088 14 39 W |
| Lick Hollow | Valley | | Cumberland | 39 20 01 N | 088 10 34 W |
| Lick Pond | Swamp | 136 | Pike | 39 26 43 N | 090 56 46 W |
| Lick Prairie Cemetery | Cemetery | 154 | Wabash | 38 29 11 N | 087 54 43 W |
| Lick Prairie Christian Church | Church | 135 | Wabash | 38 28 27 N | 087 54 42 W |
| Lick Prairie Election Precinct | Civil | 132 | Wabash | 38 28 28 N | 087 54 30 W |
| Lick Run | Stream | | Edgar | 39 46 26 N | 087 34 36 W |
| Licoln Park Boat Club | Locale | 179 | Cook | 41 55 28 N | 087 37 58 W |
| Lidice | Populated Place | 192 | Will | 41 33 17 N | 088 05 25 W |
| Lieb School | School | 187 | Cook | 41 43 34 N | 087 47 27 W |
| Liebhart Cemetery | Cemetery | 270 | Stephenson | 42 16 40 N | 089 45 19 W |
| Lierle Creek | Stream | | Adams | 39 57 26 N | 091 04 34 W |
| Lierly Cemetery | Cemetery | 223 | Adams | 39 55 48 N | 091 08 29 W |
| Lierly Cemetery | Cemetery | 220 | Adams | 39 54 57 N | 090 56 28 W |
| Lieutenant Jospeh P Kennedy Junior School | School | 181 | Cook | 41 42 13 N | 087 48 49 W |
| Lievan School (historical) | School | 218 | Lee | 41 48 08 N | 089 29 44 W |
| Life Center Church of Universal Awareness | Church | 183 | Cook | 41 47 37 N | 087 37 37 W |
| Life Line Baptist Church | Church | 181 | Cook | 41 52 00 N | 087 39 31 W |
| Life Management Center | School | 260 | Winnebago | 42 15 55 N | 089 00 19 W |
| Life Tabernacle Church | Church | 188 | Christian | 39 33 18 N | 089 17 12 W |
| Lifegate Ministries | Church | 200 | Peoria | 40 43 59 N | 089 37 55 W |
| Lifepath School of Massage Therapy | School | 241 | Peoria | 40 46 55 N | 089 37 15 W |
| Lifers Landing | Locale | 147 | Hancock | 40 14 54 N | 091 29 10 W |
| Liffick Cemetery | Cemetery | 167 | Clark | 39 22 06 N | 087 33 09 W |
| Light Chute | Stream | | Calhoun | 39 10 38 N | 090 36 13 W |
| Light House Gospel Missionary Baptist Church | Church | 181 | Cook | 41 52 19 N | 087 42 05 W |
| Light of Christ Lutheran Church | Church | 270 | McHenry | 42 10 27 N | 088 19 00 W |
| Light of the World United Church of God in Christ | Church | 183 | Cook | 41 47 24 N | 087 37 31 W |
| Lightbody Mine | Mine | 145 | Peoria | 40 33 15 N | 089 47 31 W |
| Lighthouse Baptist Church | Church | 232 | Warren | 40 54 29 N | 090 38 48 W |
| Lighthouse Cemetery | Cemetery | 250 | Ogle | 41 56 47 N | 089 18 07 W |
| Lighthouse Church | Church | 183 | Cook | 41 42 46 N | 087 45 26 W |
| Lighthouse School (historical) | School | 250 | Ogle | 41 56 48 N | 089 18 01 W |
| Lighthouse Temple Pentecostal Church | Church | 222 | Winnebago | 42 14 11 N | 089 04 36 W |
| Lightner Hospital | Hospital | 119 | Saline | 37 44 22 N | 088 32 49 W |
| Lightsville | Populated Place | 239 | Ogle | 42 08 49 N | 089 24 15 W |
| Lightsville Cemetery | Cemetery | 229 | Ogle | 42 08 39 N | 089 24 30 W |
| Liiiy Cemetery | Cemetery | 245 | Tazewell | 40 32 12 N | 089 17 11 W |
| Likely Cemetery | Cemetery | 183 | Greene | 39 24 15 N | 090 32 08 W |
| Liken School (historical) | School | 223 | Henry | 41 23 49 N | 090 11 04 W |
| Lilacia Park | Park | 215 | DuPage | 41 53 07 N | 088 01 13 W |
| Lillibridge School (historical) | School | 165 | Rock Island | 41 24 11 N | 091 01 46 W |
| Lills Park | Park | 197 | Kankakee | 41 08 55 N | 087 50 39 W |
| Lilly | Populated Place | 244 | Tazewell | 40 32 15 N | 089 17 12 W |
| Lilly Branch | Stream | | Jo Daviess | 42 24 54 N | 090 06 02 W |
| Lilly Cache School (historical) | School | 183 | Will | 41 35 16 N | 088 10 49 W |
| Lilly Cache Slough | Gut | 188 | Will | 41 38 53 N | 088 07 20 W |
| Lilly School (historical) | School | 192 | Livingston | 40 56 44 N | 088 44 38 W |
| Lilly School (historical) | School | 195 | Montgomery | 39 19 40 N | 089 36 19 W |
| Lilly School (historical) | School | 204 | Moultrie | 39 39 07 N | 088 29 29 W |
| Lilly-Freeman Elementary School | School | 126 | St. Clair | 38 37 02 N | 090 09 11 W |
| Lillyville | Populated Place | 182 | Cumberland | 39 11 23 N | 088 27 07 W |
| Lillyville Cemetery | Cemetery | 187 | Cumberland | 39 11 28 N | 088 27 15 W |
| Lillyville Elementary School | School | 184 | Cumberland | 39 11 22 N | 088 27 09 W |
| Lily Cache | Populated Place | 183 | Will | 41 35 25 N | 088 10 53 W |
| Lily Cache Creek | Stream | | Will | 41 33 59 N | 088 11 24 W |
| Lily Creek | Stream | | Effingham | 39 03 36 N | 088 36 34 W |
| Lily Dell School (historical) | School | 229 | Ford | 40 27 48 N | 088 12 45 W |
| Lily Gardens Park | Park | 183 | Cook | 41 45 47 N | 087 38 22 W |
| Lily Lake | Lake | 155 | Henderson | 40 45 45 N | 091 04 42 W |
| Lily Lake | Lake | 228 | McHenry | 42 19 49 N | 088 12 19 W |
| Lily Lake | Lake | 123 | St. Clair | 38 33 20 N | 090 10 23 W |
| Lily Lake | Populated Place | 293 | Kane | 41 56 56 N | 088 28 40 W |
| Lily Lake | Swamp | 278 | McHenry | 42 16 41 N | 088 22 19 W |
| Lily Lake Cemetery | Cemetery | 296 | Kane | 41 57 12 N | 088 28 38 W |
| Lily Lake Church | Church | 304 | Kane | 41 59 26 N | 088 27 49 W |
| Lily Lake Drain | Canal | 225 | McHenry | 42 21 06 N | 088 13 00 W |
| Lily Lake Elementary School | School | 293 | Kane | 41 56 59 N | 088 28 41 W |
| Lily Lake School (historical) | School | 232 | Lake | 42 20 05 N | 088 12 46 W |
| Lily of the Valley Baptist Church | Church | 188 | Cook | 41 53 10 N | 087 45 55 W |
| Lily of the Valley Spiritual Church | Church | 181 | Cook | 41 48 20 N | 087 37 59 W |
| Lily Pond | Lake | 138 | Pike | 39 44 57 N | 091 20 19 W |
| Lily Reid Holt Memorial Chapel | Church | 206 | Lake | 42 14 56 N | 087 49 46 W |
| Lilydale (subdivision) | Populated Place | 181 | Cook | 41 43 27 N | 087 37 31 W |
| Lilydale First Baptist Church | Church | 188 | Cook | 41 41 19 N | 087 38 22 W |
| Lilymoor | Populated Place | 232 | McHenry | 42 19 50 N | 088 12 47 W |
| Lima | Populated Place | 199 | Adams | 40 10 39 N | 091 22 43 W |
| Lima Cemetery | Cemetery | 201 | Adams | 40 11 04 N | 091 22 41 W |
| Lima Lake (historical) | Lake | 143 | Adams | 40 11 07 N | 091 26 49 W |
| Lima Quarry | Mine | 152 | Adams | 40 09 30 N | 091 24 47 W |
| Lima Slough | Gut | 143 | Adams | 40 09 02 N | 091 29 07 W |
| Limb Branch | Stream | | Williamson | 37 42 23 N | 088 57 11 W |
| Limbo School (historical) | School | 134 | Cass | 40 02 56 N | 090 20 26 W |
| Lime Creek | Stream | | Bureau | 41 27 05 N | 089 31 38 W |
| Limekiln Creek | Stream | | White | 38 09 27 N | 088 13 51 W |
| Limekiln Slough | Stream | | Pulaski | 37 17 04 N | 089 06 44 W |