State of IowaPublished to allow joining of spreadsheet data to county geometry in ESRI Maps for Office or Map Analysis Tools, contains Iowa DOM County Code (1-99) as a small integer Iowa County Number (01-99) as a padded 2-character string Census County FIPS as a both an string and integer This data was originally created by the Iowa DNR and digitized from USGS 7.5' topographic maps. Click on the data tab above to see an example of expected data. DOM-DoIT has a tutorial on how to join your spreadsheet to this Feature layer to create a new feature layer with your county based information. Please contact patrick.wilke-brown@dom.iowa.gov.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/8a1c2d500d8847d79aa47d45d44eb133_0engPublicIowa County Boundaries [Iowa]Web servicesIowaLast Modified: 2025-09-11