Lake County Illinois GISDownload In State Plane Projection Here . Lake County is governed by the 19 elected members of the County Board each representing a single district. Update Frequency: This dataset is updated on a weekly basis.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/34d280c9abf9445e8469f3b9ccd2c61d_0engLake County Illinois Open Data PortalPublicCounty Board Districts [Illinois--Lake County]Web servicesIllinois--Lake CountyIllinoisLast Modified: 2026-01-04