Jersey County
Its jail, located in Jerseyville, has a capacity of 43.
Jersey County has a population of 21,150 and is classified by the U.S. Department of Agriculture as “Metro - Counties in metro areas of 1 million population or more”.
Annual inspections
Between 2017 and 2025, the Jersey County jail has failed five of nine Illinois Department of Corrections inspections.
Inspectors cited violations to “Supervision” regulations most often, bringing it up in four of those failed inspections.
| Year | Result | Violations cited |
|---|---|---|
| 2025 | Compliant | — |
| 2024 | Noncompliant |
|
| 2023 | Noncompliant |
|
| 2022 | Compliant | — |
| 2021 | Compliant | — |
| 2020 | Noncompliant |
|
| 2019 | Compliant | — |
| 2018 | Noncompliant |
|
| 2017 | Noncompliant |
|
Each violation links to the standard it cites in the Illinois County Jail Standards. Years link to the full inspection report for that year on the IDOC website.
Extraordinary or unusual incidents
Jersey County reported 35 extraordinary or unusual incidents at its jail between 2019 and 2025 — 16.5 per 10,000 residents, the 24th highest rate of the 92 Illinois counties with a jail.
Among the 36 metropolitan counties it is 14th; those counties report a median of 8.3. The median for every county with a jail is 7.
A county reporting less could indicate lower incident rates or lower reporting rates.
Incidents per 10,000 residents
Jersey CountyMetropolitan counties Every other county with a jail
Most frequent categories
- Restraints used14
- Assault on staff2
- Fight among detainees2
- Suicide attempt1
- Hospitalization1
A single report can fall into more than one category.
Reported incidents by year
Deaths in custody
No deaths in custody were identified at the Jersey County jail.
Illinois Answers withheld the names of some of the deceased at the request of their families.
Data compiled 2026-09-15. Methodology.