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    • This is a Non-Federal dataset covered by different Terms of Use than Data.gov.

    Assessor - Parcel Addresses

    Metadata Updated: April 5, 2026

    Situs and mailing addresses of Cook County parcels. Used by the Assessor's office to mail assessment notices.

    As of 2017 owner mailing addresses in this dataset are no longer being regularly updated. We are trying to figure out a solution to this problem. Taxpayer and property addresses should be up-to-date.

    When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded.

    Additional notes:

    • Mailing addresses can be out of date or fail to properly reflect deed transfers.
    • Newer properties may be missing a mailing or property address, as they need to be assigned one by the postal service.
    • This dataset contains data for the current tax year, which may not yet be complete or final. Assessed values for any given year are subject to change until review and certification of values by the Cook County Board of Review, though there are a few rare circumstances where values may change for the current or past years after that.
    • Rowcount for a given year is final once the Assessor has certified the assessment roll all townships.
    • Data will be updated monthly.

    For more information on the sourcing of attached data and the preparation of this dataset, see the Assessor's Standard Operating Procedures for Open Data on GitHub.

    Read about the Assessor's 2025 Open Data Refresh.

    Access & Use Information

    Public: This dataset is intended for public access and use. Non-Federal: This dataset is covered by different Terms of Use than Data.gov. License: No license information was provided.

    Downloads & Resources

    Dates

    Metadata Created Date June 4, 2023
    Metadata Updated Date April 5, 2026

    Metadata Source

    Harvested from cookcountyil json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date June 4, 2023
    Metadata Updated Date April 5, 2026
    Publisher datacatalog.cookcountyil.gov
    Maintainer
    Identifier https://datacatalog.cookcountyil.gov/api/views/3723-97qp
    Data First Published 2026-03-23
    Data Last Modified 2026-03-30
    Category Property & Taxation
    Public Access Level public
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://datacatalog.cookcountyil.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id adc0b906-7a29-4403-9412-fe64b5d6aaa6
    Harvest Source Id d52781fd-51ef-4061-9cd2-535a0afb663b
    Harvest Source Title cookcountyil json
    Homepage URL https://datacatalog.cookcountyil.gov/d/3723-97qp
    Source Datajson Identifier True
    Source Hash 4fdca6f57abfa818ec23483f0bdfc0df6c431c15d5b47a8985615ca2a8389a62
    Source Schema Version 1.1

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