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 on September 23, 2026.
Kendall County, Illinois, has about 143,000 residents (2024 Census Bureau estimate), and arrests there are reported to the FBI by the Kendall County Sheriff's Office and four 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 Kendall 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: Kendall County public records, Illinois arrest records, Illinois inmate search and Illinois criminal records.
Who Makes Arrests in Kendall County
The Kendall County Sheriff's Office is the county agency that reports arrests to the FBI for Kendall County. It reported 335 arrests for 2025.
Arrests inside four of the county's cities are reported to the FBI by an agency of the city's own, listed here with the Census population and what each reported:
- Oswego, 38,778 residents: 329 arrests reported for 2025.
- Yorkville, 25,986 residents: 251 arrests reported for 2025.
- Montgomery, 21,957 residents: 220 arrests reported for 2025.
- Plano, 12,677 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 Joliet Police Department, the Plainfield Police Department, the Sandwich Police Department and two more are each listed by the FBI across several counties including Kendall County, so their arrests are not broken out for Kendall County here.
How Many Arrests Each Agency Reports in Kendall 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.
- Kendall County Sheriff's Office: 335 for 2025, 284 for 2024, 361 for 2023, 391 for 2022 and 221 for 2021.
- Oswego: 329 for 2025, 314 for 2024, 295 for 2023, 272 for 2022 and 188 for 2021.
- Yorkville: 251 for 2025, 170 for 2024, 226 for 2023 and 134 for 2022.
- Montgomery: 220 for 2025, 167 for 2024, 132 for 2023, 153 for 2022 and 179 for 2021.
- Plano: 0 for 2025, 0 for 2024, 0 for 2023, 0 for 2022, 0 for 2020 and 0 for 2019; 2021 is missing months.
Together, the five agencies with all twelve months of 2025 on file reported 1,135 arrests that year. The same agencies with both 2025 and 2024 complete reported 1,135 in 2025 against 935 in 2024, up 21 percent.
Through July 2026, the four agencies with every month so far on file reported 667 arrests, against 610 in the same months of 2025.
Booking: Where People Arrested in Kendall County Are Held
A person kept in custody after an arrest in Kendall 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 2021 the jail held about 140 people, down from about 140 in 2019. Its rated capacity in 2019, the last year with a capacity figure, was 203 beds, and it ran at 71 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 Kendall County Sheriff's Office at kendallcountyil.gov/offices/sheriff/corrections (page title: Corrections Division | Kendall County, IL), which answered when SearchSystems opened it on September 23, 2026.
A person sentenced to prison serves the sentence in a facility of the Illinois Department of Corrections, whose inmate locator is at idoc.illinois.gov/offender/inmatesearch.html.
How to Find Out About an Arrest in Kendall County
An arrest in Kendall County can be traced in two places, depending on where the case stands: the case index of the Circuit Court of Kendall County, which shows whether charges were filed and the next court date (the court records page SearchSystems verified is at kendallcountyil.gov/offices/circuit-clerk/online-court-records, phone 630-553-4183); the State's Attorney, which decides whether an arrest becomes a charge (its page is at kendallcountyil.gov/offices/state-s-attorney, phone 630-553-4157).
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 Kendall County
An arrest report belongs to the agency whose officer wrote it, and that agency releases it, not the court or the jail. 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 Kendall County Sheriff's Office: ask its records unit.
- An arrest in Oswego, Yorkville, Montgomery or Plano: 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, 630-553-4157, handles discovery for pending cases.
- The court file of a case that was filed: the Circuit Court of Kendall County, through the court records page at kendallcountyil.gov, phone 630-553-4183.
- Any county record that is not posted: the county records request page SearchSystems verified is at kendallcountyil.govqa.us (page title: KENDALL COUNTY ILLINOIS PUBLIC RECORDS CENTER).
- Your own statewide record: a name-based or fingerprint-based request to the Illinois State Police.
Cities in Kendall County: Who Reports the Arrests
The FBI lists a separate arrest reporting agency for four of the eight cities in Kendall County: Oswego, Yorkville, Montgomery and Plano. Newark, Millbrook, Lisbon and Plattville 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 Kendall County.
SearchSystems has a guide to the offices of these cities in Kendall County, with the 2024 Census Bureau population; a city with its own arrest records guide opens there:
- Oswego (38,778)
- Yorkville (25,986)
- Montgomery (21,957)
- Plano (12,677)
Frequently Asked Questions
How many arrests are made in Kendall County each year?
The Kendall County Sheriff's Office reported 335 arrests to the FBI for 2025, and the five agencies with every month of 2025 on file reported 1,135 between them.
How do I find out if someone is in jail in Kendall County?
Ask the Kendall County Sheriff's Office; its jail page SearchSystems verified is at kendallcountyil.gov.
Where are people arrested in Kendall County booked?
Those kept in custody go to the county jail, run by the Kendall County Sheriff's Office; a person cited and released at the scene is not booked.
Are arrest records public in Kendall 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 Kendall County?
From the agency that made the arrest: the Kendall 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 kendallcountyil.govqa.us.
Is this the official Kendall 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.