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.
McHenry County, Illinois, has about 316,000 residents (2024 Census Bureau estimate). A police report belongs to the agency whose officer wrote it, so which office holds a report from McHenry County depends on where the incident happened: the McHenry 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: McHenry County public records, McHenry County arrest records, McHenry County warrants, McHenry County inmate search, McHenry County criminal records, Illinois arrest records and Illinois inmate search.
Which Agency Holds a Report from McHenry 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 McHenry County that is the McHenry 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 FBI's list also carries McHenry County College (campus police) and the McHenry County Conservation District and the Crystal Lake Park District (other agency), each with a records office of its own.
The Lakemoor Police Department, the Fox Lake Police Department and the Barrington Hills Police Department are each listed by the FBI across several counties including McHenry County, so their arrests are not broken out for McHenry County here.
Reports from the McHenry County Sheriff's Office
The McHenry County Sheriff's Office is the county agency; it had 31 violent and 140 property crimes reported for 2025 and reported 820 arrests for 2025.
Its reports come from its records unit. The office's page SearchSystems verified is its jail page, at mchenrysheriff.org (page title: McHenry County IL Sheriff's Office), which answered when SearchSystems opened it on September 23, 2026.
Reports from the City Agencies in McHenry County
The 23 cities the FBI lists in McHenry County with a reporting agency of their own, the largest twelve first, with the police records page SearchSystems verified where the city has a guide:
- Crystal Lake: 48 violent and 461 property crimes reported for 2025; 818 arrests reported for 2025. The Crystal Lake police records page is at crystallake.org/your-government/departments/police/administrative-d..., phone (815) 356-3774 (verified September 25, 2026).
- Algonquin: 15 violent and 289 property crimes reported for 2025; 323 arrests reported for 2025.
- McHenry: 9 violent and 149 property crimes reported for 2025; 424 arrests reported for 2025.
- Lake in the Hills: 22 violent and 78 property crimes reported for 2025; 313 arrests reported for 2025.
- Huntley: 5 violent and 132 property crimes reported for 2025; 161 arrests reported for 2025. The Huntley police records page is at huntley.il.us/departments/police/police_reports_public_records.php, phone 847-515-5311 (verified September 25, 2026).
- Woodstock: 12 violent and 142 property crimes reported for 2025; 526 arrests reported for 2025.
- Cary: 8 violent and 64 property crimes reported for 2025; 275 arrests reported for 2025.
- Harvard: 8 violent and 53 property crimes reported for 2025; 212 arrests reported for 2025.
- Island Lake: 2 violent and 35 property crimes reported for 2025; 155 arrests reported for 2025.
- Marengo: 15 violent and 51 property crimes reported for 2025; 158 arrests reported for 2025.
- Johnsburg: 69 arrests reported for 2022.
- Spring Grove: 1 violent and 14 property crimes reported for 2025; 67 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 rest: Wonder Lake, Fox River Grove, Lakewood, Richmond, Oakwood Hills, Prairie Grove, Hebron, Bull Valley, McCullom Lake, Union and Holiday Hills.
How Many Reports: McHenry County in 2025
The 21 agencies in McHenry County with all twelve months of 2025 on file reported 183 violent and 1,665 property crimes to the FBI that year, each one a report taken by the agency that holds it.
Together, the 21 agencies in McHenry County with all twelve months of 2025 on file reported 4,544 arrests to the FBI that year, and each arrest is a report of its own.
What the Illinois Freedom of Information Act Requires
The Illinois Freedom of Information Act sets the rules: an answer within 5 business days, with one 5-day extension, at a charge of copying only after the first 50 pages, from the agency that holds the report.
A defendant who has been charged gets the report through the case: the State's Attorney, (815) 334-4159, handles discovery for pending cases.
Frequently Asked Questions
How do I get a police report in McHenry County?
From the agency whose officer took it: the McHenry 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 McHenry 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 McHenry County Sheriff's Office?
From its records unit. Under the Illinois Freedom of Information Act the answer is due within 5 business days, with one 5-day extension.
Is this the official McHenry 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.