Assessor - Parcel Addresses
Situs and mailing addresses of Cook County parcels. Used by the Assessor's office to mail assessment notices.
This dataset was updated in March 2026 to include both owner and taxpayer information. Please note that owner name and mailing address is, to our knowledge, only intermittently updated in the ias source data. Users can use Parcel Sales data to query owner and seller names.
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:
Newer properties may be missing a mailing or property address, as they need to be assigned one by the postal service.
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.
Resources
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Resource 1
APPLICATION/JSON -
Resource 2
APPLICATION/RDF+XML -
Resource 3
APPLICATION/XML -
Resource 4
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| contactPoint |
{ "fn": "Cook County Assessor's Office Data Department", "@type": "vcard:Contact", "hasEmail": "mailto:no-reply@datacatalog.cookcountyil.gov" } |
| description | Situs and mailing addresses of Cook County parcels. Used by the Assessor's office to mail assessment notices. This dataset was updated in March 2026 to include both owner <i>and</i> taxpayer information. Please note that owner name and mailing address is, to our knowledge, only intermittently updated in the ias source data. Users can use <a href="https://datacatalog.cookcountyil.gov/Property-Taxation/Assessor-Parcel-Sales/wvhk-k5uv/about_data">Parcel Sales data</a> to query owner and seller names. 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>Newer properties may be missing a mailing or property address, as they need to be assigned one by the postal service.</li> <li>Rowcount for a given year is final once the Assessor <a href="https://www.cookcountyassessor.com/assessment-calendar-and-deadlines">has certified the assessment roll</a> all townships.</li> <li>Data will be updated monthly.</li></ul>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> |
| distribution |
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| identifier | https://datacatalog.cookcountyil.gov/api/views/3723-97qp |
| issued | 2026-03-23 |
| keyword |
[ "cook county assessor", "property tax" ] |
| landingPage | https://datacatalog.cookcountyil.gov/d/3723-97qp |
| modified | 2026-06-01 |
| publisher |
{ "name": "datacatalog.cookcountyil.gov", "@type": "org:Organization" } |
| theme |
[ "Property & Taxation" ] |
| title | Assessor - Parcel Addresses |
