Cook_County_GISThe purpose of this dataset is to indicate the boundary of each Commissioner district in Cook County, Illinois. These boundaries are based off of Census 1990 geographies. Created for all users to view and understand jurisdictional boundaries within Cook County. Commissioner District boundaries are redrawn every 10 years based on the decennial census. Clerk Elections maintains Commissioner District feature. For more information on the Board of Commissioners: https://www.cookcountyil.gov/board-of-commissionersArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/fe12d15c219d4d43a25bc45a95cecc6e_1990engCook CentralPublicCommissioner District - Historical - Based on 1990 Census [Illinois--Cook County]Web servicesIllinois--Cook CountyIllinois1990