Geographic Information Systems (GIS)

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Visit our Closures page for the latest information about office closures.
We also encourage you to call before visiting any county office.
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We are a division of Clackamas County's Technology Services department. One of the advantages GIS provides is the ability to assist in the decision-making process by providing an additional tool to analyze and compare numerous geographic data layers along with traditional databases.

Questions GIS can answer include:

  • Location "Where is it?"
  • Condition "What is at?"
  • Trends "What has changed since?"
  • Patterns "What spatial patterns exist?"
  • Modeling "What if?"

Clackamas County GIS offers an online map and information retrieval tool called CMap. With this tool you can simply type an address or tax map number and receive information about that particular parcel. A map accompanies the information with the option to display aerial imagery.

The county's GIS contains a wealth of information that can be used with specialized software. From the buttons on the left, you can get more information on our various products and services.

Aerial Photography

Orthophotographs are aerial photos which have been scanned and rectified to the earth's surface. These photos can be used by themselves or we can overlay other GIS information on them such as tax lots, contours, soils, etc. Printed imagery for the years from 2005 to 2010 can be purchased. We offer two sizes of finished plots from our storefront:

  • Small plots $15 (approximate size 18" x 18")
  • Large plots $35 (approximate size 34" x 34")

Often, we can print the map while you wait or call ahead and we will have it ready for you. We can even center your point of interest on a map.  We can also plot maps at specific scales if need be.

We offer our orthophotos as a digital file. These images are available in 1 foot, 2 foot, or 10-foot pixel resolutions. The cost is $35 for the first image and $30 for each additional image (If ordered at the same time). These images are in TIF format. Please contact us at for details.

Custom Maps

Through our custom mapping services, you can specify:

  • scale and area
  • page size and layout
  • titles and labeling
  • data layers needed

We will also consult with you to help you understand which options will best meet your needs. We can create custom maps with your choice of the many data layers contained in the County's Geographic Information System. Due to limited resources, we can not provide analytical work.

Custom maps are billed at a flat hourly rate of $65 per hour. Material costs are dependent on the size of the map.

To talk to us about your custom map request, drop by our office at 168 Warner Milne Road, Oregon City or call us at 503-655-8322.

Clackamas County GIS Data Portal

The products accessed through the Clackamas County GIS Data Portal are for informational purposes and may not have been prepared for, or be suitable for legal, engineering, or surveying purposes. All data is provided as is, at no charge, and no further support is offered by Clackamas County GIS including offering the data in different formats. Data is offered as shapefiles. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information. Metadata does accompany each shapefile. The use of these shapefiles is governed by our GIS Data Licensing Agreement, which will be presented upon selecting a layer to download, and must be agreed to before the data can be downloaded. Data will be updated periodically and the update date will be reflected in the metadata.

  • Soils
    Soil survey developed by the National Cooperative Soil Survey.
  • Streams
    Hydro line features and names of lakes, rivers and streams.
  • Tax Lots
    Clackamas County tax lots with basic attributes.
  • Streets
    Street centerline data with street names.

Digital Data

We offer digital formats in ArcInfo Exchange files or Shapefiles.

There are two ways to get digital GIS data from Clackamas County.

  • We have partnered with Metro to assist us in distributing our data. For more information about how to subscribe to RLIS, Metro's Regional Land Information System
  • You can also get digital GIS data directly from Clackamas County. We have numerous GIS data layers, several of which are not found on RLIS. Pricing varies by layer and the geographic extent of your data needs.

For more information, please call us at 503-655-8322.

Scanned Tax Maps

Scanned Assessor tax maps of Clackamas County tax lots are available through a statewide program called ORMAP. ORMAP is administered by the Oregon State Department of Revenue. Clicking on the link below will transport you to their site. Please read the help section to better navigate the ORMAP site. Access to scanned tax lot maps can also be found using CMap.

Scanned tax maps are also available on CDs for purchase from the Clackamas County Assessor's Office. These images are more current than the images displayed on the ORMAP site. Contact the Assessor's Office at 503-655-8671 for details.


168 Warner Milne Road Oregon City, OR 97045

Office Hours:

⚠ Visit our Closures page for the latest information about office closures.
We also encourage you to call before visiting any county office.