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 2, 2026.
Sycamore, Illinois, in DeKalb County, has about 19,000 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Sycamore is held at the county jail, run by the DeKalb 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: Sycamore public records, DeKalb County inmate search, Sycamore arrest records, Sycamore warrants, Sycamore criminal records, Sycamore court records, Illinois arrest records and Illinois inmate search.
Finding Someone in Custody in Sycamore
A person kept in custody after an arrest in Sycamore is held at the county jail, run by the DeKalb County Sheriff's Office, whichever agency made the arrest.
SearchSystems opened and checked the custody page of the DeKalb County Sheriff's Office at dekalbsheriff.com (page title: DeKalb County Jail, IN Inmate Roster, Booking, Arrests, Warrants), a site that blocks automated checks (HTTP 403), so open it in a browser.
Someone booked recently shows on that page; someone cited and released at the scene, or held a few hours at a city station, does not.
The DeKalb County Jail by the Numbers
On an average day in 2023 the jail held about 120 people, up from about 100 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 140 beds, and it ran at 75 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
DeKalb County has about 101,000 residents (2024 Census Bureau estimate), so the jail holds about 12 people for every 10,000 residents.
Who Books People Into the DeKalb County Jail
The DeKalb County Sheriff's Office and the agency that reports for Sycamore (filed by the FBI as Sycamore Police Department) make the arrests that end in a booking in and around Sycamore.
The FBI's agency list also places one more agency in DeKalb County: Northern Illinois University (campus police).
The Maple Park Police Department is listed by the FBI across two counties including DeKalb County, so its arrests are not broken out for DeKalb County here.
The largest arrest counts reported to the FBI were DeKalb's 1,477 for 2025, the DeKalb County Sheriff's Office's 341 for 2025 and Sycamore's 301 for 2025.
Together, the nine agencies in DeKalb County with all twelve months of 2025 on file reported 2,362 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 Sycamore 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 DeKalb 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 Sycamore?
Look on the custody page of the DeKalb County Sheriff's Office at dekalbsheriff.com. It covers people booked into the county jail.
How many people are in the DeKalb County jail?
About 120 on an average day in 2023, the latest year in the Vera Institute's jail data, against a rated capacity of 140 beds.
Where do people sentenced to prison in DeKalb 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 Sycamore 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.