Chicago Police Department - Illinois Uniform Crime Reporting (IUCR) Codes

Illinois Uniform Crime Reporting (IUCR) codes are four digit codes that law enforcement agencies use to classify criminal incidents when taking individual reports. These codes are also used to aggregate types of cases for statistical purposes. In Illinois, the Illinois State Police establish IUCR codes, but the agencies can add codes to suit their individual needs. The Chicago Police Department currently uses more than 400 IUCR codes to classify criminal offenses, divided into “Index” and “Non-Index” offenses. Index offenses are the offenses that are collected nation-wide by the Federal Bureaus of Investigation’s Uniform Crime Reports program to document crime trends over time (data released semi-annually), and include murder, criminal sexual assault, robbery, aggravated assault & battery, burglary, theft, motor vehicle theft, and arson. Non-index offenses are all other types of criminal incidents, including vandalism, weapons violations, public peace violations, etc.

伊利诺伊州统一犯罪报告（Illinois Uniform Crime Reporting, IUCR）代码是一套四位数编码体系，供执法机构在受理单个报案报告时对犯罪事件进行分类。此类代码同时也可用于聚合各类案件以开展统计分析工作。在伊利诺伊州境内，IUCR代码由伊利诺伊州警察局制定，但各执法机构可根据自身业务需求增设自定义代码。目前芝加哥警察局采用超过400种IUCR代码对刑事犯罪进行分类，相关犯罪可划分为“索引型（Index）”与“非索引型（Non-Index）”两大类。索引型犯罪是指由美国联邦调查局统一犯罪报告计划在全国范围内收集、用于追踪长期犯罪趋势的犯罪类型，该计划每半年发布一次相关统计数据，具体包括谋杀、刑事性侵犯、抢劫、严重袭击与殴打、入室盗窃、盗窃、机动车盗窃以及纵火。非索引型犯罪则涵盖其余所有刑事事件类型，包括故意损坏财物、武器违规、公共秩序违规等。