Cook_County_GISCreated for all users to view and understand jurisdictional boundaries within Cook County. GIS department maintains Municipality feature. Clerk Tax Services maintains Political Township feature. Clerk Elections maintains Commissioner District feature. Service published in 2019. Data is updated as needed.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/b3acc7df1a484c10b46072e2dc009894_2010engCook CentralPublicCommissioner District - Historical - Effective 2014-2022 based on 2010 Census [Illinois--Cook County]Web servicesIllinois--Cook CountyIllinois2014-2022