Cook_County_GISMunicipal boundaries in Cook County, Illinois drawn in accordance to the Next Generation 9-1-1 standards. These boundaries are used by Cook County Emergency Telephone System Board (ETSB) for reference in 9-1-1 dispatch. Boundaries align with street centerlines.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/3ba83defdf4e4e47b2089dfe592e5c31_0engCook CentralPublicNext Generation 9-1-1 Municipalities [Illinois--Cook County]Web servicesIllinois--Cook CountyIllinoisLast Modified: 2022-08-16