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 4, 2026.
Iroquois County, Illinois, has about 26,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Iroquois County is held at the county jail, run by the Iroquois 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: Iroquois County public records, Iroquois County arrest records, Iroquois County warrants, Iroquois County criminal records, Iroquois County court records, Illinois arrest records and Illinois inmate search.
Finding Someone in Custody in Iroquois County
A person kept in custody after an arrest in Iroquois County is held at the county jail, run by the Iroquois County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Iroquois County Sheriff's Office at iroquoiscountyil.gov/offices/sheriff (page title: Iroquois County Sheriff | Iroquois County), phone (815) 432-6992, which answered when SearchSystems opened it on October 4, 2026.
That page is the office's jail information page rather than a roster, so a search for a particular person goes through the office at (815) 432-6992.
The Iroquois County Jail by the Numbers
On an average day in 2023 the jail held about 21 people, down from about 29 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 30 beds, and it ran at 97 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Iroquois County has about 26,000 residents (2024 Census Bureau estimate), so the jail holds about 8 people for every 10,000 residents.
Who Books People Into the Iroquois County Jail
The Iroquois County Sheriff's Office and the agencies that report for Watseka, Clifton, Onarga, Milford and Sheldon make the arrests that end in a booking in Iroquois County.
The largest arrest counts reported to the FBI were Milford's 1,152 for 2025, Sheldon's 1,152 for 2025 and Watseka's 178 for 2025.
Together, the five agencies in Iroquois County with all twelve months of 2025 on file reported 2,620 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 Iroquois County arrest records.
From the Jail to State Prison
A sentence of more than a year is served in state prison, not the jail; the Illinois Department of Corrections lists its inmates at idoc.illinois.gov/offender/inmatesearch.html.
Frequently Asked Questions
How do I find an inmate in Iroquois County?
Ask the Iroquois County Sheriff's Office at (815) 432-6992; its jail page SearchSystems verified is at iroquoiscountyil.gov/offices/sheriff.
How many people are in the Iroquois County jail?
About 21 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 30 beds.
What is the phone number for the Iroquois County jail?
(815) 432-6992, the number on the page of the Iroquois County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Iroquois 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 Iroquois 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.