Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. The jail figures are from the Vera Institute of Justice's Incarceration Trends data. Every office link was opened and checked against the office's own site between September 23, 2026 and October 9, 2026.
Marshall County, Illinois, has about 12,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Marshall County is held at the county jail, run by the Marshall County Sheriff's Office, and the jail's record of each person held is a public record. This guide says where to look for someone in custody, what the jail holds and who books people into it.
This guide covers the search, the jail, who books people, state prison and common questions.
Related guides: Marshall County public records, Marshall County arrest records, Marshall County warrants, Marshall County criminal records, Marshall County court records, Illinois arrest records and Illinois inmate search.
Finding Someone in Custody in Marshall County
A person kept in custody after an arrest in Marshall County is held at the county jail, run by the Marshall County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the custody page of the Marshall County Sheriff's Office at sheriffmarshallcounty.org/current-inmate-roster (page title: Private Site), which answered when SearchSystems opened it on October 9, 2026.
That page is the place to look for someone booked recently. A person cited and released at the scene, or held only a few hours by a city department, will not be on it.
The Marshall County Jail by the Numbers
On an average day in 2024 the jail held about 2 people, up from about 1 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 16 beds, and it ran at 6 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Marshall County has about 12,000 residents (2024 Census Bureau estimate), so the jail holds about 2 people for every 10,000 residents.
Who Books People Into the Marshall County Jail
The Marshall County Sheriff's Office and the agencies that report for Henry and Lacon make the arrests that end in a booking in Marshall County.
The Washburn Police Department is listed by the FBI across two counties including Marshall County, so its arrests are not broken out for Marshall County here.
The largest arrest counts reported to the FBI were the Marshall County Sheriff's Office's 60 for 2025, Lacon's 5 for 2025 and Henry's 3 for 2025.
Together, the three agencies in Marshall County with all twelve months of 2025 on file reported 68 arrests to the FBI that year. Those kept in custody were booked into the county jail; a person cited and released at the scene was not.
The counts, agency by agency and year by year, are in Marshall County arrest records.
From the Jail to State Prison
The jail holds people awaiting trial and people serving short sentences. A person sentenced to prison in Marshall County serves the sentence in a facility of the Illinois Department of Corrections, whose inmate locator is at idoc.illinois.gov/offender/inmatesearch.html.
Frequently Asked Questions
How do I find an inmate in Marshall County?
Look on the custody page of the Marshall County Sheriff's Office at sheriffmarshallcounty.org. It covers people booked into the county jail.
How many people are in the Marshall County jail?
About 2 on an average day in 2024, the latest year in the Vera Institute's jail data, against a rated capacity of 16 beds.
Where do people sentenced to prison in Marshall County go?
To a facility of the Illinois Department of Corrections; its inmate locator is at idoc.illinois.gov/offender/inmatesearch.html.
Is this the official Marshall County website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official county, court and state offices described above and does not hold records, charge for them or take requests.