data.cityofchicago.orgZIP Code boundaries in Chicago. 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).Shapefilehttps://data.cityofchicago.org/api/views/gdcf-axmwengCity of Chicago Data PortalPublicBoundaries - ZIP Codes [Illinois--Chicago]DatasetsIllinois--ChicagoIllinoisContinually updated resource