Assessor - Ron Sandstrom
Assessor Ron Sandstrom

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Welcome to ASPIN
The Jefferson County Assessor's Parcel Map Internet Application.

This program provides access to the Jefferson County parcel layer. Using it, you can:
  • view & select parcels graphically,
  • print maps,
  • perform queries using Parcel ID & Schedule Number,
  • link to static parcel maps (requires Acrobat Reader),
  • link to tabular information from the Assessor's appraisal database.

  • To search the Assessor's appraisal database using tabular data other than Parcel ID
    or Schedule Number, use the links to the left. Please read through the following information before using this application.
    If you agree to these conditions, scroll down and click "I have read these conditions
    and I Accept" to launch ASPIN.
    If you click "I Do Not Accept," you will return to the Assessor's homepage.

    Pop Up Blockers must be disabled for this site to work properly.

    Acrobat Reader is required to view and save parcel maps. If you
    need Acrobat Reader, use the 'Get Acrobat Reader' link to the left.

    This site will be unavailable each morning from approximately
    2:00 AM until 2:15 AM.

    Parcel data utilized by this application is updated each Monday morning.

    Map annotation (text including parcel numbers, subdivision
    names, etc.) is currently available only on the static parcel maps
    in PDF format. Use the 'Click on Map & Link to Parcel Map' option
    within ASPIN to access the static parcel maps.

    Some property record types are not spatially tied to the Jefferson
    County parcel layer, and will not be found using ASPIN. A partial list
    of these types includes oil and mineral rights, personal property, mobile
    homes, and some condominiums and townhomes. For more information
    about these records, please use the Assessor's Property Record Search,
    or contact our office directly.

    Records Disclaimer:
    This information is prepared as an ongoing commitment to the public to provide quality and up-to-date information. While the Jefferson County Assessor's Office believes the data to be current and accurate, Jefferson County assumes no liability for any incorrect or incomplete information or data. The user of this information and data assumes all risk associated with such use.

    This is an informational service and will be maintained during normal business hours, 8:00 a.m. to 5 p.m., Monday through Friday. If any service interruption occurs during non-business hours, the problem will be addressed at the beginning of the next business day.

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    Send mail to with questions or comments about this Web site.
    Copyright @ 2015, Jefferson County, Colorado.  All rights reserved. 

    Copyright @ 2015 - Jefferson County, Colorado. All rights reserved.