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 September 25, 2026.
Joliet, Illinois, in Will County, has about 152,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Joliet is held at the county jail, run by the Will 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: Joliet public records, Will County inmate search, Joliet arrest records, Joliet warrants, Joliet criminal records, Joliet court records, Illinois arrest records and Illinois inmate search.
Finding Someone in Custody in Joliet
A person kept in custody after an arrest in Joliet is held at the county jail, run by the Will County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the jail page of the Will County Sheriff's Office at willcosheriff.org/component/search/?searchword=Facility (page title: Search | WC Sheriff's Office), phone (815) 727-8575, 16911, which answered when SearchSystems opened it on September 23, 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) 727-8575.
The Will County Jail by the Numbers
On an average day in 2021 the jail held about 600 people, down from about 690 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 909 beds, and it ran at 76 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Will County has about 709,000 residents (2024 Census Bureau estimate), so the jail holds about 8 people for every 10,000 residents.
Who Books People Into the Will County Jail
The Will County Sheriff's Office and the agency that reports for Joliet (filed by the FBI as Joliet Police Department) make the arrests that end in a booking in and around Joliet.
The FBI's agency list also places three campus police departments and three other agencies in Will County (the arrest records guide names each one).
The Orland Park Police Department, the Tinley Park Police Department, the Park Forest Police Department and seven more are each listed by the FBI across several counties including Will County, so their arrests are not broken out for Will County here.
The largest arrest counts reported to the FBI were Joliet's 1,975 for 2025, the Will County Sheriff's Office's 978 for 2025 and Bolingbrook's 555 for 2025.
Together, the 24 agencies in Will County with all twelve months of 2025 on file reported 7,010 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 Joliet 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 Joliet?
Ask the Will County Sheriff's Office at (815) 727-8575; its jail page SearchSystems verified is at willcosheriff.org.
How many people are in the Will County jail?
About 600 on an average day in 2021, the latest year in the Vera Institute's jail data, against a rated capacity of 909 beds.
What is the phone number for the Will County jail?
(815) 727-8575, the number on the page of the Will County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Will 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 Joliet website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official city, county, court and state offices described above and does not hold records, charge for them or take requests.