The institution with the highest average inmate age is Taylorville Correctional Center.
Illinois Prison Populations in February 2020
| Institution | Population | Average age |
|---|---|---|
| Taylorville Correctional Center | 982 | 45 |
| Big Muddy River Correctional Center | 1,182 | 44 |
| Dixon Correctional Center | 2,168 | 43 |
| East Moline Correctional Center | 1,099 | 41 |
| Robinson Correctional Center | 1,066 | 41 |
| Joliet Treatment Center | 213 | 41 |
| Pontiac Correctional Center | 1,122 | 41 |
| Lincoln Correctional Center | 959 | 40 |
| Menard Correctional Center | 2,183 | 40 |
| Stateville Correctional Center | 2,746 | 40 |
| Decatur Correctional Center | 535 | 40 |
| Hill Correctional Center | 1,608 | 40 |
| Vienna Correctional Center | 936 | 40 |
| Jacksonville Correctional Center | 1,065 | 39 |
| Danville Correctional Center | 1,598 | 39 |
| Graham Correctional Center | 1,795 | 39 |
| Logan Correctional Center | 1,549 | 39 |
| Centralia Correctional Center | 1,249 | 38 |
| Vandalia Correctional Center | 972 | 38 |
| Lawrence Correctional Center | 2,028 | 38 |
| Western Illinois Correctional Center | 1,658 | 38 |
| Illinois River Correctional Center | 1,806 | 38 |
| Kewanee Life Skills Re-Entry Center | 257 | 38 |
| Shawnee Correctional Center | 1,550 | 37 |
| Southwestern Illinois Correctional Center | 581 | 37 |
| Sheridan Correctional Center | 1,655 | 36 |
| Pinckneyville Correctional Center | 2,093 | 35 |
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