The Illinois Uniform Crime Reporting (I-UCR) Program serves as the state repository for the collection of crime statistics. The program’s primary objective is to generate reliable information for use in law enforcement administration, operation and management. As the program has evolved and the demand for transparency increased, so has the demand for the data compiled under this program. Members of the public, legislators, media and academia rely on this data for information on fluctuations in the level of crime from year-to-year in their communities and throughout the state. On January 1, 2021, Illinois transitioned from the traditional Summary Reporting System (SRS) to the more robust National Incident-Based Reporting System (NIBRS). This data portal will serve as a tool to provide greater transparency with crime data being reported to the I-UCR Program.

The I-UCR Program makes every effort to ensure accuracy in reporting by providing training, as well as quality control checks on the data received from Illinois’ law enforcement agencies. The accuracy of the statistics depends primarily on the adherence of each contributing agency to established standards of reporting, therefore, it is the responsibility of each contributor to submit accurate information and correct any data found to be submitted in error. It is important to note that participation in the I-UCR Program by law enforcement agencies is mandated by Illinois statute (50 ILCS 709/5-12).

Information About the Data

In 2021, the Illinois Uniform Crime Reporting (I-UCR) Program updated reporting requirements and developed a new crime reporting database, the Illinois NIBRS Repository. As part of the transition, the I-UCR Program migrated data for 2016 through 2020. Due to differences in the technical specification for historical data, the reported results for 2016 through 2022 should be interpreted with caution. Starting in 2023, agency data will be published only after achieving NIBRS certification. While the certification process helps ensure the accuracy and completeness of reported data, agencies maintain responsibility for their submissions. Therefore, data used in the available crime reports is based only on submissions by certified agencies.



Crime by County per 1,000 Population
Crime Count by Offense