| Air Weather Service Technical Library | SCA |
| Argonne National Laboratory | ANL |
| Big Muddy River Correctional Center | L#G |
| Centralia Correctional Center | YIO |
| Danville Correctional Center Library | D8C |
| Dixon Correctional Center | JS8 |
| East Moline Correctional Center | ZDV |
| FIC Greenville Prison | G5V |
| Graham Correctional Center Library | IL5 |
| Illinois Association of School Boards | SKB |
| Illinois Commerce Commission | JHQ |
| Illinois Department of Employment Security | LBN |
| Illinois Department of Public Health | D9I |
| Illinois Department of Transportation | IZA |
| Illinois Environmental Protection Agency | JDT |
| Illinois Natural History Survey Library | JZ0 |
| Illinois River Correctional Center | IG5 |
| Illinois State Archives | I7A |
| Illinois State Curriculum Center | JB3 |
| Illinois State Geological Survey Library | JZ1 |
| Illinois State Historical Library | JFK |
| Illinois State Library | SPI |
| Illinois State Museum | JM9 |
| Illinois State Water Survey Library | LR1 |
| Illinois Student Assistance Commission | IL@ |
| Illinois Veterans Home | JNI |
| Illinois Veteran's Home | I9D |
| Illinois Waste Management and Research Center | JY1 |
| Illinois Youth Center Library | L#U |
| Illinois Youth Center Library - Joliet | ON4 |
| Illinois Youth Center-Harrisburg | L$A |
| Jacksonville Correctional Center | JGC |
| Kane County Adult Corrections | PK0 |
| Lincoln Correctional Center Library | ZYV |
| Logan Correctional Center | JB4 |
| Menard Correctional Center | L$F |
| National Center for Food Safety & Technology | NGH |
| National Council of Teachers of English (NCTE) | MJ0 |
| Naval Training Center | QH6 |
| North Shore Congregation Isreal | QH7 |
| Office of the Auditor General Library | JBC |
| Pinckneyville Correctional Center Library | L$O |
| Railroad Retirement Board Library | RRB |
| Robinson Correctional Center | TOO |
| Scott Air Force Base Library | BLV |
| Shawnee Correctional Center | L$U |
| Sheridan Correctional Center | TE6 |
| Southwestern Illinois Correctional Center | S$W |
| Stateville Correctional Center | I9R |
| Tamms Correctional Center Library | L5X |
| Taylorville Correctional Center Library | NF# |
| U.S. Army CERL | AFD |
| U.S. Attorney's Office | XJ5 |
| U.S. Courts Library Southern District | JW8 |
| U.S. Department of Agriculture | AGN |
| U.S. Environmental Protection Agency Region 5 | ELA |
| United States Penitentiary (Marion) | U#S |
| USAF Medical Center | JW9 |
| Vandalia Correctional Center | RSZ |
| Vienna Correctional Center | L5Z |
| Western Illinois Correctional Center | JGO |
Arranged By Region:
Arranged By Type of Library:
| Academic | Government | ILCSO | School |
| Business & Law | Health Sciences | Public | Theology |