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 on September 23, 2026.
Mercer County, Illinois, has about 15,000 residents (2024 Census Bureau estimate). A police report belongs to the agency whose officer wrote it, so which office holds a report from Mercer County depends on where the incident happened: the Mercer County Sheriff's Office for the unincorporated county, the agency that reports for the city inside a city. This guide names each agency, where its records page is and what the Illinois Freedom of Information Act requires of it.
This guide covers which agency, the sheriff's reports, the cities' reports, how many reports, what the law requires and common questions.
Related guides: Mercer County public records, Mercer County arrest records, Mercer County warrants, Mercer County inmate search, Mercer County criminal records, Illinois arrest records and Illinois inmate search.
Which Agency Holds a Report from Mercer County
The report of an incident is released by the agency that took it; the court and the jail hold their own records of the same event, but not the report.
In Mercer County that is the Mercer County Sheriff's Office for the unincorporated county and for any city that contracts with it for police service, and the agency that reports for a city where the city has one of its own.
The Alexis Police Department is listed by the FBI across two counties including Mercer County, so its arrests are not broken out for Mercer County here.
Reports from the Mercer County Sheriff's Office
The Mercer County Sheriff's Office is the county agency; it reported 0 arrests for 2020.
Its reports come from its records unit, reached through the office at (309) 582-5194. The office's page SearchSystems verified is its jail page, at mercercosheriff.org (page title: Mercer County Sheriff, IL), phone (309) 582-5194, 906 SW 3rd St. Aledo, IL 61231, which answered when SearchSystems opened it on September 23, 2026.
Reports from the City Agencies in Mercer County
The two cities the FBI lists in Mercer County with a reporting agency of their own:
- Aledo: 4 violent and 15 property crimes reported for 2024; 11 arrests reported for 2025.
- Viola: 0 arrests reported for 2020.
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.
How Many Reports: Mercer County in 2024
The one agency in Mercer County with all twelve months of 2024 on file reported 4 violent and 15 property crimes to the FBI that year, each one a report taken by the agency that holds it.
Aledo reported 34 arrests to the FBI for 2024, and each arrest is a report of its own.
What the Illinois Freedom of Information Act Requires
Under the Illinois Freedom of Information Act the agency 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 request goes to the agency that holds the report, in writing, and does not have to say why the report is wanted.
Any other county record goes through the county records request page SearchSystems verified, at mercercosheriff.org/foia/index.php (page title: Mercer County Sheriff, IL).
A defendant who has been charged gets the report through the case: the State's Attorney, (309) 582-5381, handles discovery for pending cases.
Frequently Asked Questions
How do I get a police report in Mercer County?
From the agency whose officer took it: the Mercer 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.
How long does an agency in Mercer County have to answer?
Under the Illinois Freedom of Information Act, within 5 business days, with one 5-day extension. It may charge copying only after the first 50 pages.
How do I get a report from the Mercer County Sheriff's Office?
From its records unit, reached through the office at (309) 582-5194. Under the Illinois Freedom of Information Act the answer is due within 5 business days, with one 5-day extension.
Is this the official Mercer 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.