| AP8 | Joliet Junior College |
| CGU | University of Chicago |
| IAA | Chicago State University |
| IAC | DePaul University |
| IAD | Eastern Illinois University |
| IAF | Governors State University |
| IAG | Greenville College |
| IAH | Illinois Institute of Technology |
| IAI | Illinois State University |
| IAK | Lake Forest College |
| IAL | Loyola University |
| IAO | Northeastern Illinois University |
| IAP | Oakton Community College |
| IAQ | Parkland College |
| IAR | Roosevelt University |
| IAS | University of Illinois at Springfield |
| IAT | Southern Illinois University at Edwardsville |
| IAV | Southern Illinois School of Medicine |
| IAW | Triton College |
| IAY | University of Illinois at Chicago |
| IAZ | Western Illinois University |
| IBA | Bradley University |
| IBE | Dominican University |
| IBI | College of DuPage |
| IBJ | Harold Washington College |
| IBK | Knox College |
| IBQ | Quincy University |
| IBR | Rockford College |
| IBU | Eureka College |
| IBZ | Columbia College |
| ICA | Aurora University |
| ICD | University of St. Francis |
| ICG | Benedictine University |
| ICH | Illinois College |
| ICI | MacMurray College |
| ICJ | McKendree College |
| ICK | Milikin University |
| ICL | Monmouth College |
| ICN | North Central College |
| ICO | Illinois Wesleyan University |
| ICS | Saint Xaivier University |
| ICV | Elmhurst College |
| ICW | Wheaton College |
| ICX | Lewis University |
| ICY | Augustana College |
| ICZ | North Park University |
| IDI | Northern Baptist Theological Seminary |
| IDJ | Catholic Theological Union |
| IDL | Rush University |
| IDP | Prairie State College |
| IFH | Judson College |
| IGB | National-Lewis University |
| IHR | Carl Sandberg College |
| IL9 | St. Augustine College |
| ILO | School of the Art Institute of Chicago |
| IMB | Kishwaukee College |
| INM | Northwestern-Galter Health Sciences Library |
| INU | Northwestern University |
| IVG | Sauk Valley Community College |
| JAM | Moraine Valley Community College |
| JBE | Olivet Nazarene University |
| JCV | Elgin Community College |
| JDB | Wilbur Wright College |
| JDR | Illinois College Of Optometry |
| JFE | National University of Health Sciences |
| JFG | Midwestern University |
| JFU | Loyola University - Medical Center Library |
| JIB | Springfield College in Illinois |
| JNA | Northern Illinois University |
| JOP | Blessing Health Professions |
| JUX | Southeastern Illinois College |
| JVH | Illinois Mathematics & Science Academy |
| JVQ | Robert Morris College |
| JVU | Danville Area Community College |
| JYJ | Rock Valley College |
| LCX | Illinois Valley Community College |
| MS5 | Midstate College |
| N2B | Northwestern Business College |
| SOI | Southern Illinois University at Carbondale |
| UIU | University of Illinois at Urbana-Champaign |