Assessor - Permits

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.

Data and Resources

Field Value
accessLevel public
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://datacatalog.cookcountyil.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier https://datacatalog.cookcountyil.gov/api/views/6yjf-dfxs
issued 2025-04-28
landingPage https://datacatalog.cookcountyil.gov/d/6yjf-dfxs
modified 2025-09-04
publisher datacatalog.cookcountyil.gov
resource-type Dataset
source_datajson_identifier true
source_hash 6d63561f44a0459fbbdbd07fcef83de5d482a6560353b7f302956a68ace8d53b
source_schema_version 1.1
theme {"Property & Taxation"}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • AmeriGEO
  • AmeriGEOSS
  • CKAN
  • GEO
  • GEOSS
  • National
  • North America
  • United States
  • cook-county-assessor
  • property-tax
isopen False
license_id notspecified
license_title License not specified
maintainer Cook County Assessor's Office Data Department
maintainer_email no-reply@datacatalog.cookcountyil.gov
metadata_created 2025-09-24T23:05:43.781009
metadata_modified 2025-09-24T23:05:43.781018
notes 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:<ul> <li>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.</li> <li>In addition to permits that are already closed, this dataset includes permits that are <b>currently open or pending</b>. These permits are not final and are subject to change.</li> <li>Data will be updated monthly.</li></ul> <li>Rows are unique by the combination of "pin", "permit_number", and "date_issued".</li> <li>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.</li> <li>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.</li> <li>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.</li> <li>"date_issued" is more reliable than "date_submitted". Prefer "date_issued" when making temporal comparisons between parcels.</li> <li>Data for the current tax year may not yet be complete or final.</li> For more information on the sourcing of attached data and the preparation of this dataset, see the <a href="https://github.com/ccao-data/wiki/blob/master/SOPs/Open-Data.md">Assessor's Standard Operating Procedures for Open Data</a> on GitHub. <a href="https://datacatalog.cookcountyil.gov/stories/s/gzdr-q7c4">Read about the Assessor's 2025 Open Data Refresh.</a>
num_resources 4
num_tags 10
title Assessor - Permits