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

    Assessor - Permits

    Metadata Updated: February 8, 2026

    Historical permit data submitted by municipalities to the Cook County Assessor's Office.

    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:

    • Almost all of the data in this dataset, such as address, estimated date of completion, work description, and permit amount, is data submitted by municipalities to the CCAO. The CCAO verifies or corrects the PIN number, determines whether the work is assessable, updates the status of CCAO workflows (e.g., open or closed), and sets the recheck year.
    • In addition to permits that are already closed, this dataset includes permits that are currently open or pending. These permits are not final and are subject to change.
    • Data will be updated monthly.
  • Rows are unique by the combination of "pin", "permit_number", and "date_issued".
  • Job codes and improvement codes are not correct in all cases. Consider "work_description" to be the canonical description of the work that the permit describes.
  • In many past cases permits have been submitted in irreconcilably different formats by different municipalities, or not at all. As such, this dataset does not represent the complete universe of permits in all municipalities, but rather represents the universe of permits that the CCAO knows about.
  • Each row represents a parcel and a permit that is associated with that parcel. Permits may be associated with multiple parcels, and parcels may be associated with multiple permits.
  • "date_issued" is more reliable than "date_submitted". Prefer "date_issued" when making temporal comparisons between parcels.
  • Data for the current tax year may not yet be complete or final.

    • 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 March 22, 2025
    Metadata Updated Date February 8, 2026

    Metadata Source

    Harvested from cookcountyil json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date March 22, 2025
    Metadata Updated Date February 8, 2026
    Publisher datacatalog.cookcountyil.gov
    Maintainer
    Identifier https://datacatalog.cookcountyil.gov/api/views/6yjf-dfxs
    Data First Published 2026-02-02
    Data Last Modified 2026-02-02
    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 a1f18f3c-26d6-4dc0-95aa-eea1715d4314
    Harvest Source Id d52781fd-51ef-4061-9cd2-535a0afb663b
    Harvest Source Title cookcountyil json
    Homepage URL https://datacatalog.cookcountyil.gov/d/6yjf-dfxs
    Source Datajson Identifier True
    Source Hash f0f59b89b0717df259d477323a4999bcbad156a7a6cfd392b9fb021b57cd331f
    Source Schema Version 1.1

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