Lake County Illinois GISDownload In State Plane Projection Here . Political townships are those with elected officials - township supervisor, assessor, road commissioner, etc. However, Zion Township is uniquely defined in law as being coterminous with the City of Zion. Since the city can and does annex additional land, whenever it does so the boundary of Zion Township also changes to match it. Update Frequency: This dataset is updated on a weekly basis.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/9ed310e9268649edbc42db2bddc6fa6e_3engLake County Illinois Open Data PortalPublicPolitical Townships [Illinois--Lake County]Web servicesIllinois--Lake CountyIllinoisLast Modified: 2026-01-04