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.
Rock Island County, Illinois, has about 143,000 residents (2024 Census Bureau estimate), and arrests there are reported to the FBI by the Rock Island County Sheriff's Office, seven city agencies and one campus 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 Rock Island 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: Rock Island County public records, Illinois arrest records, Illinois inmate search and Illinois criminal records.
Who Makes Arrests in Rock Island County
The Rock Island County Sheriff's Office is the county agency that reports arrests to the FBI for Rock Island County. It reported 302 arrests for 2025.
Arrests inside seven 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:
- Moline, 42,442 residents: 911 arrests reported for 2025.
- Rock Island, 36,434 residents: 1,090 arrests reported for 2025.
- East Moline, 20,995 residents: 494 arrests reported for 2025.
- Silvis, 8,003 residents: 95 arrests reported for 2025.
- Milan, 5,033 residents: 108 arrests reported for 2025.
- Coal Valley, 3,883 residents: 19 arrests reported for 2025.
- Hillsdale, 413 residents.
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 FBI's agency list also places one more agency in Rock Island County: Black Hawk College at Moline (campus police).
How Many Arrests Each Agency Reports in Rock Island County
The FBI publishes every agency's monthly arrest counts 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.
- Rock Island: 1,090 for 2025, 1,177 for 2024, 1,020 for 2023, 1,083 for 2022 and 1,122 for 2021.
- Moline: 911 for 2025, 833 for 2024, 734 for 2023, 838 for 2022 and 859 for 2021.
- East Moline: 494 for 2025, 240 for 2024, 228 for 2023 and 272 for 2021; 2022 is missing months.
- Rock Island County Sheriff's Office: 302 for 2025, 221 for 2024, 134 for 2023, 187 for 2022 and 212 for 2021.
- Milan: 108 for 2025, 105 for 2024, 92 for 2023 and 63 for 2022.
- Silvis: 95 for 2025, 110 for 2024, 97 for 2023, 73 for 2022 and 92 for 2021.
- Coal Valley: 19 for 2025, 20 for 2024, 15 for 2023, 57 for 2022, 30 for 2021 and 0 for 2020.
Together, the seven agencies with all twelve months of 2025 on file reported 3,019 arrests that year. The same agencies with both 2025 and 2024 complete reported 3,019 in 2025 against 2,706 in 2024, up 12 percent.
Through July 2026, the six agencies with every month so far on file reported 1,680 arrests, against 1,425 in the same months of 2025.
Booking: Where People Arrested in Rock Island County Are Held
The county jail is where a person arrested in Rock Island 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 2023 the jail held about 190 people, down from about 270 in 2019. Its rated capacity in 2023 was 329 beds, and it ran at 57 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 Rock Island County Sheriff's Office at rockislandcountyil.gov/318/Sheriffs-Office (page title: Sheriff's Office | Rock Island County, IL), phone 309-558-3432, 1317 Third Avenue County Justice Center Rock Island, IL 61201, Monday through Friday 8 am to 4:30 pm, which answered when SearchSystems opened it on September 23, 2026.
A sentence of more than a year is served in state prison; the Illinois Department of Corrections lists its inmates at idoc.illinois.gov/offender/inmatesearch.html.
How to Find Out About an Arrest in Rock Island County
For Rock Island County the place to look is the State's Attorney, which decides whether an arrest becomes a charge (its page is at rockislandcountyil.gov/309/States-Attorney, phone 309-558-3240).
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 Rock Island 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 Rock Island County Sheriff's Office: ask its records unit, reached through the office at 309-558-3432.
- An arrest in Moline, Rock Island, East Moline, Silvis, Milan, Coal Valley 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 Black Hawk College at Moline: the records office of the agency involved.
- A defendant who has been charged gets the report through the case: the State's Attorney, 309-558-3240, handles discovery for pending cases.
- Any county record that is not posted: the county records request page SearchSystems verified is at rockislandcountyil.gov (page title: Information & Copy Requests | Rock Island County, IL).
- Your own statewide record: a name-based or fingerprint-based request to the Illinois State Police.
Cities in Rock Island County: Who Reports the Arrests
The FBI lists a separate arrest reporting agency for seven of the 15 cities in Rock Island County: Moline, Rock Island, East Moline, Silvis, Milan, Coal Valley and Hillsdale. Carbon Cliff, Hampton, Port Byron, Andalusia, Rapids City, Cordova, Reynolds and Oak Grove 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 Rock Island County.
SearchSystems has a guide to the offices of these cities in Rock Island County, with the 2024 Census Bureau population; a city with its own arrest records guide opens there:
- Moline (42,442)
- East Moline (20,995)
- Silvis (8,003)
Frequently Asked Questions
How many arrests are made in Rock Island County each year?
Rock Island reported 1,090 arrests to the FBI for 2025, and the seven agencies with every month of 2025 on file reported 3,019 between them.
How do I find out if someone is in jail in Rock Island County?
Ask the Rock Island County Sheriff's Office at 309-558-3432; its jail page SearchSystems verified is at rockislandcountyil.gov/318/Sheriffs-Office.
Where are people arrested in Rock Island County booked?
Those kept in custody go to the county jail, run by the Rock Island County Sheriff's Office; a person cited and released at the scene is not booked.
Are arrest records public in Rock Island 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 Rock Island County?
From the agency that made the arrest: the Rock Island 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 rockislandcountyil.gov.
Is this the official Rock Island 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.