Kendall County
Its jail, located in Yorkville, has a capacity of 107.
Kendall County has a population of 143,171 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 Kendall County jail has failed zero of nine Illinois Department of Corrections inspections.
| Year | Result | Violations cited |
|---|---|---|
| 2025 | Compliant | — |
| 2024 | Compliant | — |
| 2023 | Compliant | — |
| 2022 | Compliant | — |
| 2021 | Compliant | — |
| 2020 | Compliant | — |
| 2019 | Compliant | — |
| 2018 | Compliant | — |
| 2017 | Compliant | — |
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
Kendall County reported 31 extraordinary or unusual incidents at its jail between 2019 and 2025 — 2.2 per 10,000 residents, the 71st highest rate of the 92 Illinois counties with a jail.
Among the 36 metropolitan counties it is 28th; 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
Kendall CountyMetropolitan counties Every other county with a jail
Most frequent categories
- Assault on staff8
- Restraints used6
- Fight among detainees4
- Suicide attempt3
- OC spray used3
A single report can fall into more than one category.
Reported incidents by year
Deaths in custody
Between 2019 and 2025, 1 person died in custody of the Kendall County sheriff. Of those, 1 was not counted in state oversight data.
Each death in the Kendall County jail
Uncounted
No deaths in custody were identified at the Kendall County jail.
Illinois Answers withheld the names of some of the deceased at the request of their families.
Data compiled 2026-09-15. Methodology.