Police beats in Chicago that were effective through December 18, 2012. The current police beats boundaries are always available at https://data.cityofchicago.org/d/aerh-rz74. The data can be viewed on the Chicago Data Portal with a web browser. However, to view or use the files outside of a web browser, you will need to use compression software and special GIS software, such as ESRI ArcGIS (shapefile) or Google Earth (KML or KMZ), is required.