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), and arrests there are reported to the FBI by the Grundy County Sheriff's Office and five city agencies. An arrest leaves the same records whoever makes it: the arresting agency's report, the record of anyone held at the county jail, and, if the State's Attorney files charges, a case in the Circuit Court of Grundy County. This guide says who keeps each one, what it costs and who may see it, with the arrest counts each agency reported.
This guide covers who makes arrests, how many arrests, booking and the jail, finding an arrest, copies, cities and common questions.
Related guides: Grundy County public records, Illinois arrest records, Illinois inmate search and Illinois criminal records.
Who Makes Arrests in Grundy County
The Grundy County Sheriff's Office is the county agency that reports arrests to the FBI for Grundy County. It reported 330 arrests for 2025.
The FBI lists five cities in Grundy County with a reporting agency of their own, with the Census population and what each reported:
- Morris, 14,587 residents: 363 arrests reported for 2025.
- Minooka, 12,907 residents: 243 arrests reported for 2025.
- Coal City, 5,810 residents: 94 arrests reported for 2025.
- Diamond, 2,702 residents: 0 arrests reported for 2025.
- Mazon, 982 residents: 0 arrests reported for 2025.
A city on that list is reported separately whether the officers are the city's own or the sheriff's under contract; the FBI's list does not say which.
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.
How Many Arrests Each Agency Reports in Grundy County
Each agency reports its arrests to the FBI by month, and the FBI publishes them on the Crime Data Explorer. These are the full-year totals, all offenses, as the FBI held them on October 8, 2026; a year with months missing or not reported is left out.
- Morris: 363 for 2025, 402 for 2024, 423 for 2023, 409 for 2022 and 502 for 2021.
- Grundy County Sheriff's Office: 330 for 2025, 328 for 2024, 389 for 2023 and 499 for 2022.
- Minooka: 243 for 2025, 292 for 2024, 216 for 2023 and 103 for 2022.
- Coal City: 94 for 2025, 174 for 2024, 87 for 2023 and 62 for 2021; 2022 is missing months.
- Mazon: 0 for 2025, 5 for 2024, 4 for 2023, 0 for 2020 and 0 for 2019; 2021 and 2022 are missing months.
- Diamond: 0 for 2025, 1 for 2024, 1 for 2023, 0 for 2022, 0 for 2020 and 0 for 2019; 2021 is missing months.
Together, the six agencies with all twelve months of 2025 on file reported 1,030 arrests that year. The same agencies with both 2025 and 2024 complete reported 1,030 in 2025 against 1,202 in 2024, down 14 percent.
Booking: Where People Arrested in Grundy County Are Held
A person kept in custody after an arrest in Grundy County is held at the county jail, whichever agency made the arrest, apart from the short stay some city departments' own holding cells allow; a person cited and released at the scene is not booked at all. The jail's record of each person held, with the charges, is a public record of the arrest, and the court file takes over from there.
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.
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.
A sentence of more than a year is served in state prison; the Illinois Department of Corrections lists its inmates at idoc.illinois.gov/offender/inmatesearch.html.
How to Find Out About an Arrest in Grundy County
Whether someone was arrested in Grundy County, and what came of it, shows up in two places: the case index of the Circuit Court of Grundy County, which shows whether charges were filed and the next court date (the court records page SearchSystems verified is at grundycountyil.gov/services/circuit_court_clerk, phone (815) 941-3256); the State's Attorney, which decides whether an arrest becomes a charge (its page is at grundycountyil.gov/services/states_attorney/index.php, phone (815) 941-3276).
Illinois is one of the states that lets anyone look up another person's statewide criminal history: conviction information is public under the Uniform Conviction Information Act, through the Illinois State Police. That record shows what agencies reported to the state, which is wider than one county's court index but can lag it.
Getting a Copy of an Arrest Record in Grundy County
The report of an arrest is released by the agency that made it; the jail and the court hold their own records of the same event, but not the report. Under the Illinois Freedom of Information Act the agency must answer within 5 business days, with one 5-day extension, and it may charge copying only after the first 50 pages.
- An arrest by the Grundy County Sheriff's Office: ask its records unit, reached through the office at 815-941-3243.
- An arrest in Morris, Minooka, Coal City, Diamond or Mazon: the records unit of the agency that reports for that city; the city guides linked above name each city's records office.
- A defendant who has been charged gets the report through the case: the State's Attorney, (815) 941-3276, handles discovery for pending cases.
- The court file of a case that was filed: the Circuit Court of Grundy County, through the court records page at grundycountyil.gov, phone (815) 941-3256.
- Any county record that is not posted: the county records request page SearchSystems verified is at grundycountyil.gov (page title: Grundy County, IL).
- Your own statewide record: a name-based or fingerprint-based request to the Illinois State Police.
Cities in Grundy County: Who Reports the Arrests
The FBI lists a separate arrest reporting agency for five of the 12 cities in Grundy County: Morris, Minooka, Coal City, Diamond and Mazon. Gardner, Braceville, South Wilmington, Carbon Hill, Verona, Kinsman and East Brooklyn have no separate reporting agency in the FBI's list.
Wherever in the county the arrest happens, a person kept in custody goes to the county jail and the case goes to the Circuit Court of Grundy County.
SearchSystems has a guide to the offices of these cities in Grundy County, with the 2024 Census Bureau population; a city with its own arrest records guide opens there:
Frequently Asked Questions
How many arrests are made in Grundy County each year?
Morris reported 363 arrests to the FBI for 2025, and the six agencies with every month of 2025 on file reported 1,030 between them.
How do I find out if someone is in jail 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.
Where are people arrested in Grundy County booked?
Those kept in custody go to the county jail, run by the Grundy County Sheriff's Office; a person cited and released at the scene is not booked.
Are arrest records public in Grundy County?
The court files of criminal cases are public, and so is the statewide criminal history kept by the Illinois State Police: conviction information is public under the Uniform Conviction Information Act. The arrest report itself is released by the agency that made the arrest, under the Illinois Freedom of Information Act.
How do I get a copy of an arrest report in Grundy County?
From the agency that made the arrest: the Grundy County Sheriff's Office for its own arrests, or the agency that reports for the city where it happened. Under the Illinois Freedom of Information Act the answer is due within 5 business days, with one 5-day extension; the county records request page SearchSystems verified is at grundycountyil.gov.
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.