Iowa Department of TransportationThe feature class contains the current county borders for the State of Iowa. These boundaries have been cartographically enhanced to reflect the major changes along the Missouri and Mississippi Rivers.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/a29d66123f1046e8acefeff2ee121fa3_0engIowaDOT Open DataPublicCounty [Iowa]Web servicesIowaLast Modified: 2026-01-02