The following table presents the current classification system(s) used by each collection at the University of Illinois Library.
| Library | Classification |
| ACES-Funk (includes CPLA Reference & Resouce Center) |
LC Classification for all incoming materials, beginning January 1, 2021 Existing collection in DDC |
| Architecture & Art |
DDC LC Classification for all incoming Zine books, beginning September 9, 2021. |
| Carle Illinois College of Medicine |
DDC for all incoming materials beginning March 11, 2019 Existing collection in LC Classification. |
| Center for Children's Books | S-Collection |
| Chemistry | DDC |
| Classics | LC Classification for all incoming materials, beginning September 9, 2021. |
| Communications |
LC Classification for all incoming materials, beginning August 1, 2018 Existing collection in DDC |
| Conservation Lab | DDC |
| Engineering-Grainger |
DDC *LC Classification for Grainger Popular Materials (engpopmat) from May, 2024. |
| History, Philosophy, and Newspaper (includes African American Research Center) |
LC Classification for all incoming materials, except reference collection, beginning January 16, 2020 |
| International & Area Studies |
LC Classification for:
DDC for:
|
| Law | LC Classification |
| Literatures and Languages | LC Classification; DDC for non-circulating |
| Main Stacks (CAS) - Asian | LC Classification |
| Main Stacks (CAS) - all new literature | LC Classification |
| Main Stacks (CAS) - LABO | LC Classification |
| Map |
LC Classification for maps LC Classification for all incoming material beginning Sept. 18, 2018 Existing collection is being re-classed from DDC to LC |
| Mathematics | DDC |
| Music and Performing Arts | LC Classification |
| Rare Book and Manuscript Library | DDC; local classification |
| Reference, Research, and Scholarly Services | DDC |
| Residence Hall Libraries | DDC; local classification |
| Scholarly Commons (see exceptions to item records) | LC Classification |
| Social Sciences, Health, and Education |
LC Classification for new & re-classed materials
Special classifications for S-Collection and Curriculum Collection |
| Sousa Archives & Center for American Music | LC Classification |
| Undergraduate | LC Classification; DDC for periodicals |
| University Archives | DDC; local classification |
| University High School | DDC; local classification for Fiction and Graphic Novels |
| Veterinary Medicine | DDC |