Illinois Department of TransportationMap service containing IL Boundaries - Counties, IDOT Districts, Congressional Districts, House of Representative Districts, Senate Districts, Political Townships, Urban Areas, Metropolitan Planning Organization (MPO), Towns.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/7a84dffd6cec428d8ab9ee2f3053685b_4engIllinois DOT Open Data PortalPublicIL Senate [Illinois]Web servicesIllinoisLast Modified: 2021-07-30