Lake County Illinois GISDownload In State Plane Projection Here . Park district boundaries are based on legal documents filed in the office of the Recorder of Deeds and on court orders. Mapping is based on the legal descriptions from those documents, which relate to existing parcel, municipal, township and PLSS features. Attributes include the park name. Update Frequency: This dataset is updated on a weekly basis.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/8df706ae1b784276ae02e9b4550da6ae_0engLake County Illinois Open Data PortalPublicState Parks [Illinois--Lake County]Web servicesIllinois--Lake CountyIllinoisLast Modified: 2026-01-04