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.
Grundy County, Illinois, has about 54,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Grundy County is held at the county jail, run by the Grundy 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: Grundy County public records, Grundy County arrest records, Grundy County warrants, Grundy County criminal records, Grundy County court records, Illinois arrest records and Illinois inmate search.
Finding Someone in Custody in Grundy County
The county jail, run by the Grundy County Sheriff's Office, holds everyone kept in custody after an arrest in Grundy County, from every agency.
SearchSystems opened and checked the jail page of the Grundy County Sheriff's Office at grundycountyil.gov/services/sheriff/jail.php (page title: Grundy County, IL), phone 815-941-3243, 111 E. Washington St. Morris, IL 60450, Monday thru Friday 8:00am to 4:00pm., 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 815-941-3243.
The Grundy County Jail by the Numbers
On an average day in 2019 the jail held about 33 people. Its rated capacity in 2019 was 67 beds, and it ran at 49 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Grundy County has about 54,000 residents (2024 Census Bureau estimate), so the jail holds about 6 people for every 10,000 residents.
Who Books People Into the Grundy County Jail
The Grundy County Sheriff's Office and the agencies that report for Morris, Minooka, Coal City, Diamond and Mazon make the arrests that end in a booking in Grundy County.
The Braidwood Police Department, the Godley Police Department, the Channahon Police Department and two more are each listed by the FBI across several counties including Grundy County, so their arrests are not broken out for Grundy County here.
The largest arrest counts reported to the FBI were Morris's 363 for 2025, the Grundy County Sheriff's Office's 330 for 2025 and Minooka's 243 for 2025.
Together, the six agencies in Grundy County with all twelve months of 2025 on file reported 1,030 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 Grundy 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 Grundy 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 Grundy County?
Ask the Grundy County Sheriff's Office at 815-941-3243; its jail page SearchSystems verified is at grundycountyil.gov/services/sheriff/jail.php.
How many people are in the Grundy County jail?
About 33 on an average day in 2019, the latest year in the Vera Institute's jail data, against a rated capacity of 67 beds.
What is the phone number for the Grundy County jail?
815-941-3243, the number on the page of the Grundy County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Grundy 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 Grundy 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.