Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest and crime counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. Every office link was opened and checked against the office's own site between September 23, 2026 and October 2, 2026.
DeKalb County, Illinois, has about 101,000 residents (2024 Census Bureau estimate). In Illinois the public criminal record is the court file, kept by the Circuit Clerk; the statewide criminal history kept by the Illinois State Police is open to anyone who asks. This guide says where each record of a criminal case from DeKalb County is kept and how it is seen.
This guide covers the court file, the statewide record, local arrest records, the crimes behind the records, the prosecutor, sex offender registry, records requests and common questions.
Related guides: DeKalb County public records, DeKalb County arrest records, DeKalb County warrants, DeKalb County inmate search, DeKalb County court records, Illinois arrest records and Illinois inmate search.
Criminal Cases in the Circuit Court of DeKalb County
In Illinois the public criminal record is the court file. Criminal cases from DeKalb County are heard by the Circuit Court of DeKalb County, which hears every civil, criminal, family, probate, traffic and juvenile case, and the file of each case is kept by the Circuit Clerk.
For DeKalb County, SearchSystems opened and checked the court records page for the county at dekalbgastatecourt.gov (page title: DeKalb County State Court), which answered when SearchSystems opened it on September 23, 2026.
Illinois has no single public index of every trial court case; each court's records are looked up through that court.
The Illinois Criminal History and Your Own Copy
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. The result is the repository record, what agencies reported to the state, which is wider than one county's court index but can lag it.
To see your own record, the route is a name-based or fingerprint-based request to the Illinois State Police. The state page SearchSystems verified for it is at isp.illinois.gov/BureauOfIdentification/MyRecord.
Arrest Records Kept Locally in DeKalb County
The DeKalb County Sheriff's Office and the agencies that report for DeKalb, Sycamore, Sandwich, Genoa, Cortland, Hinckley and four more cities keep the arrest records in DeKalb County: the report and the booking record of each arrest stay with the agency that made it, separate from the court file and from the state repository.
The FBI's agency list also places one more agency in DeKalb County: Northern Illinois University (campus police); it keeps the records of its own arrests.
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.
Together, the nine agencies in DeKalb County with all twelve months of 2025 on file reported 2,362 arrests to the FBI that year; how each case ended is in the court file, not in the arresting agency's.
The agencies and their counts, year by year, are in DeKalb County arrest records.
The Crimes Behind the Records: DeKalb County in 2025
The nine agencies in DeKalb County with all twelve months of 2025 on file reported 157 violent and 1,229 property crimes to the FBI that year; the same agencies with both 2025 and 2024 complete reported 1,386 crimes in 2025 against 1,591 in 2024. Each reported crime is a report on file with the agency that took it, and each arrest that follows is the start of a criminal record.
The full crime section, agency by agency, is on the DeKalb County public records guide.
The State's Attorney for DeKalb County
The State's Attorney decides which arrests in DeKalb County become charges and files them in the Circuit Court of DeKalb County; the office answers questions about pending prosecutions, and the case files themselves are court records.
The office's page SearchSystems verified is at dekalbcounty.org/departments/states-attorneys-office (page title: State's Attorney's Office), phone 815-895-7164, 133 West State Street Sycamore, IL 60178, which answered when SearchSystems opened it on September 23, 2026.
The Sex Offender Registry for DeKalb County
Registered sex offenders living in DeKalb County are listed on the Illinois Sex Offender Registry, run by the Illinois State Police at illinois.gov. The registry is public and can be searched online.
Registration itself is done in person with the local agency where the registrant lives: the sheriff's office, or the city police in a city with its own department.
Asking an Agency in DeKalb County for a Record
An arrest report, a booking record or a local criminal history letter comes from the agency that holds it, not from the court.
Under the Illinois Freedom of Information Act a county office must answer a request within 5 business days, with one 5-day extension, and it may charge copying only after the first 50 pages. The county records request page SearchSystems verified is at dekalbcounty.org/services/forms-publications/freedom-of-information... (page title: Request for Public Records -- Freedom of Information Act (FOIA)).
Frequently Asked Questions
Are criminal records public in DeKalb 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.
Can I search DeKalb County criminal cases online?
The court records page SearchSystems verified for the county is at dekalbgastatecourt.gov (page title: DeKalb County State Court).
How do I get my own Illinois criminal history?
Through a name-based or fingerprint-based request to the Illinois State Police.
Who prosecutes crimes in DeKalb County?
The State's Attorney, reached at 815-895-7164, which files its cases in the Circuit Court of DeKalb County.
Is this the official DeKalb 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.