Mason County
Its jail, located in Havana, has a capacity of 44.
Mason County has a population of 12,543 and is classified by the U.S. Department of Agriculture as “Nonmetro - Urban population of fewer than 5,000, adjacent to a metro area”.
Annual inspections
Between 2017 and 2025, the Mason County jail has failed nine of nine Illinois Department of Corrections inspections.
Inspectors cited violations to “Security” regulations most often, bringing it up in nine of those failed inspections.
| Year | Result | Violations cited |
|---|---|---|
| 2025 | Noncompliant |
|
| 2024 | Noncompliant |
|
| 2023 | Noncompliant |
|
| 2022 | Noncompliant |
|
| 2021 | Noncompliant |
|
| 2020 | Noncompliant |
|
| 2019 | Noncompliant |
|
| 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
Mason County reported 10 extraordinary or unusual incidents at its jail between 2019 and 2025 — 8 per 10,000 residents, the 42nd highest rate of the 92 Illinois counties with a jail.
Among the 32 rural counties it is 8th; those counties report a median of 5. 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
Mason CountyRural counties Every other county with a jail
Most frequent categories
- Battery5
- Suicide attempt2
- Assault on staff2
- Fight among detainees2
- Assault on a detainee1
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 Mason County jail.
Illinois Answers withheld the names of some of the deceased at the request of their families.
Data compiled 2026-09-15. Methodology.