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.
LaSalle County, Illinois, has about 108,000 residents (2024 Census Bureau estimate), and arrests there are reported to the FBI by the La Salle County Sheriff's Office, 15 city agencies and one other agency. 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 LaSalle 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: LaSalle County public records, Illinois arrest records, Illinois inmate search and Illinois criminal records.
Who Makes Arrests in LaSalle County
The La Salle County Sheriff's Office is the county agency that reports arrests to the FBI for LaSalle County. It reported 240 arrests for 2025.
The FBI lists 15 cities in LaSalle County with a reporting agency of their own, with the Census population and what each reported, the largest twelve first; the rest are named in the cities section below:
- Ottawa, 18,775 residents: 618 arrests reported for 2025.
- Streator, 12,295 residents: 375 arrests reported for 2025.
- Peru, 9,793 residents: 173 arrests reported for 2025.
- LaSalle, 9,424 residents: 76 arrests reported for 2025.
- Mendota, 6,922 residents: 82 arrests reported for 2025.
- Marseilles, 4,779 residents: 33 arrests reported for 2025.
- Oglesby, 3,626 residents: 29 arrests reported for 2025.
- Sheridan, 2,413 residents: 1,152 arrests reported for 2025.
- Seneca, 2,310 residents: 0 arrests reported for 2025.
- Earlville, 1,598 residents: 0 arrests reported for 2019.
- North Utica, 1,343 residents: 6 arrests reported for 2025.
- Leland, 928 residents: 4 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 Somonauk Police Department is listed by the FBI across two counties including LaSalle County, so its arrests are not broken out for LaSalle County here.
The FBI's agency list also places one more agency in LaSalle County: Tri-County Drug Enforcement Narcotics Team (other).
How Many Arrests Each Agency Reports in LaSalle 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.
- Sheridan: 1,152 for 2025, 1,152 for 2024, 1,146 for 2023, 1,132 for 2022, 919 for 2021 and 1,146 for 2020.
- Ottawa: 618 for 2025, 514 for 2024, 610 for 2023 and 397 for 2022.
- Streator: 375 for 2025, 292 for 2024 and 214 for 2023.
- La Salle County Sheriff's Office: 240 for 2025, 272 for 2024, 438 for 2023 and 1,348 for 2022.
- Peru: 173 for 2025, 176 for 2024, 244 for 2023 and 175 for 2022.
- Mendota: 82 for 2025, 82 for 2024 and 109 for 2023.
- LaSalle: 76 for 2025, 32 for 2024, 45 for 2023, 43 for 2022, 0 for 2020 and 0 for 2019; 2021 is missing months.
- Marseilles: 33 for 2025, 37 for 2024, 69 for 2023, 55 for 2022, 0 for 2020 and 0 for 2019; 2021 is missing months.
- Oglesby: 29 for 2025, 28 for 2024, 25 for 2023, 24 for 2022 and 0 for 2019; 2020 and 2021 are missing months.
- North Utica: 6 for 2025, 2 for 2024, 1 for 2023 and 0 for 2019; 2020, 2021 and 2022 are missing months.
- Leland: 4 for 2025, 3 for 2024, 4 for 2023, 8 for 2022, 0 for 2021 and 0 for 2019; 2020 is missing months.
- Tonica: 0 for 2025, 0 for 2024, 0 for 2020 and 0 for 2019; 2021, 2022 and 2023 are missing months.
Together, the 13 agencies with all twelve months of 2025 on file reported 2,788 arrests that year. The same agencies with both 2025 and 2024 complete reported 2,788 in 2025 against 2,590 in 2024, up 7.6 percent.
Through June 2026, the ten agencies with every month so far on file reported 1,326 arrests, against 1,274 in the same months of 2025.
Grand Ridge and Earlville reported only part of 2025 (11 months and 11 months) and are left out of the totals.
Booking: Where People Arrested in LaSalle County Are Held
The county jail is where a person arrested in LaSalle County and kept in custody ends up, whichever agency made the arrest, though a city department may hold someone in its own cells first and a person cited and released at the scene is never booked. The jail's record of each person held, with the charges, is a public record of the arrest, and once the person is released or sentenced the record continues in the court file.
On an average day in 2019 the jail held about 110 people. Its rated capacity in 2019 was 306 beds, and it ran at 37 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
SearchSystems opened and checked the custody page of the La Salle County Sheriff's Office at lasalleso.com/inmateSearch (page title: LaSalle Parish Sheriff's Office (LA)), which answered when SearchSystems opened it on September 23, 2026.
That page is the place to look for someone who was booked recently; a person cited and released at the scene, or held only a few hours by a city department, will not be on it.
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 LaSalle County
An arrest in LaSalle County can be traced in two places, depending on where the case stands: the custody page of the La Salle County Sheriff's Office described above, for anyone booked into the county jail; the State's Attorney, which decides whether an arrest becomes a charge (its page is at lasallecountyil.gov/m/directory/department?did=30, phone 815-434-8340).
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 LaSalle 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 La Salle County Sheriff's Office: ask its records unit.
- An arrest in Ottawa, Streator, Peru, LaSalle, Mendota, Marseilles or another of the cities listed above: the records unit of the agency that reports for that city; the city guides linked above name each city's records office.
- An arrest by Tri-County Drug Enforcement Narcotics Team: the records office of the agency involved.
- A defendant who has been charged gets the report through the case: the State's Attorney, 815-434-8340, handles discovery for pending cases.
- Any county record that is not posted: the county records request page SearchSystems verified is at lasallecounty.com (page title: FOIA/Public Records).
- Your own statewide record: a name-based or fingerprint-based request to the Illinois State Police.
Cities in LaSalle County: Who Reports the Arrests
The FBI lists a separate arrest reporting agency for 15 of the 24 cities in LaSalle County: the twelve named above and Tonica, Grand Ridge and Dana. Millington, Lostant, Naplate, Ransom, Cedar Point, Rutland, Kangley, Troy Grove and Leonore 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 LaSalle County.
SearchSystems has a guide to the offices of these cities in LaSalle 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 LaSalle County each year?
Sheridan reported 1,152 arrests to the FBI for 2025, and the 13 agencies with every month of 2025 on file reported 2,788 between them.
How do I find out if someone is in jail in LaSalle County?
Look on the custody page of the La Salle County Sheriff's Office at lasalleso.com/inmateSearch. It covers people booked into the county jail.
Where are people arrested in LaSalle County booked?
Those kept in custody go to the county jail, run by the La Salle County Sheriff's Office; a person cited and released at the scene is not booked.
Are arrest records public in LaSalle 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 LaSalle County?
From the agency that made the arrest: the La Salle 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 lasallecounty.com.
Is this the official LaSalle 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.