Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Jefferson Plaza Shopping Center | Locale | 198 | Will | 41 31 25 N | 088 06 25 W |
| Jefferson Square Mall Shopping Center | Locale | 192 | Will | 41 31 13 N | 088 08 37 W |
| Jensen Woods Camp | Locale | 214 | Brown | 40 03 37 N | 090 51 30 W |
| Jersey County Farm (historical) | Locale | 192 | Jersey | 39 08 30 N | 090 26 21 W |
| Joe Louis 'The Champ' Golf Course | Locale | 182 | Cook | 41 39 14 N | 087 38 40 W |
| Joe Louis Golf Course | Locale | 182 | Cook | 41 39 18 N | 087 38 41 W |
| Johannot (historical) | Locale | 205 | Vermilion | 40 21 32 N | 087 35 16 W |
| John E Egan Water Reclamation Plant | Locale | 217 | Cook | 42 01 05 N | 088 02 20 W |
| John S and Hope Barnes Tennis Courts | Locale | 259 | Winnebago | 42 16 08 N | 089 01 00 W |
| Johns Spur | Locale | 110 | Jackson | 37 40 25 N | 089 28 02 W |
| Johnson Landing | Locale | 128 | Calhoun | 38 52 51 N | 090 32 31 W |
| Johnson Siding | Locale | 183 | Logan | 40 08 33 N | 089 17 29 W |
| Johnstowne Mall Shopping Center | Locale | 184 | Shelby | 39 24 16 N | 088 49 02 W |
| Joliet Country Club | Locale | 191 | Will | 41 29 48 N | 088 03 16 W |
| Joliet Mall Shopping Center | Locale | 184 | Will | 41 34 35 N | 088 09 55 W |
| Jonesville School (historical) | Locale | 275 | Lee | 41 41 45 N | 089 00 55 W |
| Jordan Center | Locale | 225 | Whiteside | 41 53 15 N | 089 41 12 W |
| Junction City Shopping Center | Locale | 244 | Peoria | 40 45 30 N | 089 35 32 W |
| Kampsville Landing | Locale | 132 | Calhoun | 39 18 15 N | 090 36 40 W |
| Kankakee Bridge Station (historical) | Locale | 162 | Will | 41 21 15 N | 088 12 30 W |
| Kankakee Country Club | Locale | 189 | Kankakee | 41 06 13 N | 087 50 18 W |
| Kankakee County Fairground | Locale | 190 | Kankakee | 41 03 52 N | 087 52 22 W |
| Kankakee Elks Country Club | Locale | 188 | Kankakee | 41 05 06 N | 087 46 54 W |
| Karbers Ridge Recreatrion Site | Locale | 182 | Hardin | 37 34 52 N | 088 19 28 W |
| Karnes Siding | Locale | 202 | Macoupin | 39 02 45 N | 089 44 39 W |
| Kellogg Golf Course | Locale | 228 | Peoria | 40 46 55 N | 089 38 43 W |
| Kelso Hollow Amphitheater | Locale | 181 | Menard | 39 58 45 N | 089 50 50 W |
| Kemper Lakes Public Golf Course | Locale | 236 | Lake | 42 12 23 N | 088 02 00 W |
| Kemper Landing | Locale | 116 | Monroe | 38 09 43 N | 090 16 30 W |
| Kennedy Square Shopping Center | Locale | 217 | Rock Island | 41 29 30 N | 090 27 23 W |