Cook_County_GISThe provisioning boundary represents the service area for Cook County's Emergency Telephone System Board (ETSB), which handles 9-1-1 dispatch for unincorporated Cook County and several municipalities. It is updated as needed.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/5c2265d6022f4306b4b61289bb3b6e5d_1engCook CentralPublicETSB Provisioning Boundary [Illinois--Cook County]Web servicesIllinois--Cook CountyIllinoisLast Modified: 2023-06-20