Open Data Portal

Connecting users with GIS information

Welcome to the Linn County, Iowa GIS Open Data Portal. This site contains open access to geospatial content within Linn County, Iowa. Use the Search for Data window above to search for a dataset based on keywords. Datasets of similar content by are organized into categories below.

Datasets are available for download in various formats. Options for consuming services in GeoJSON or GeoService format are available for most datasets.

Don't want to download an entire dataset? Not a problem. Filter data by attribute values using the Data tab for a layer or use the map to zoom to an area of interest and be sure to specify you want to download a filtered dataset when retrieving content.


Explore Data Categories


Popular open data categories are shown below. Datasets found within each category are similar in nature. Can't find what you're looking for? Use the Search for Data window at the top to search for datasets based on keywords.

Note: FEMA datasets found within the Hydrography category are NOT maintained by Linn County. The County extracts these datasets on a bi-annual basis. For current FEMA data, view the official National Flood Hazard web map.

Popular Datasets


Below are a few of the more popular datasets users often request. Click on a card to explore the dataset in more detail. View dataset features by zooming to an area of interest, or view the attributes of a dataset to learn more about the data behind the geometry.


  • Parcel Ownership:   This parcels dataset is updated every weekday. It joins parcel geometry to County tax system information to provide users with a rich dataset of information.

  • Address Point:   Our address points represent the situs address of a location. This dataset is updated as needed by the Real Estate group within the Auditor's Office.

  • Road Centerline:   This roads layer is primarily used for dual range address location and road classification. This dataset is updated as needed by the Real Estate group within the Auditor's Office.

  • Boundary:   This layer displays political township boundaries which include incorporated and unincorporated areas. This dataset is updated as needed by the Real Estate group within the Auditor's Office.

  • Parcel Ownership


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    Parcel Ownership

    Explore Linn County parcels with ownership and other supplemental information

    • Address Point


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      Address Point

      Explore Linn County site address points, our most accurate means of locating an address

      • Road


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        Road Centerline

        Explore Linn County road centerlines, including address ranges and road classification

        • Boundary


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          Boundary

          Explore Linn County incorporated and unincorporated
          boundaries

Featured Applications


Below are featured map applications found on the Linn County GIS Portal site. Apps provide intuitive access to information and tools for citizens to understand our community. We recommend exploring the apps below as well as visiting our GIS Portal site for more maps and apps.

  • Land Records


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    Land Records

    Explore Linn County, Iowa detailed land records

    • Imagery Download


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      Imagery Download

      Download our most recent source imagery tiles

      • Flood Hazard


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        Flood Hazards

        Browse FEMA data to see if a property is within flood hazard areas

        • Printable Maps


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          Printable Maps

          Looking for a hard copy map?
          Explore the Printable Maps app.