Disclaimer: This list is updated monthly on the website. If up-to-the-minute accuracy is needed, contact us at 312-603-6328. This dataset contains businesses registered for Amusement Home Rule, Dealer Use Tax Home Rule, Diesel Home Rule Tax, Firearm Tax, Gasoline Home Rule Tax, Liquor Home Rule Tax, New Motor Vehicle Home Rule, Tobacco Wholesale, and Parking Home Rule Tax. It does not currently contain Retail Manufacturer.

Foreclosures, Mortgages, and Quit Claim Deeds recorded with the Cook County Recorder of Deeds. Data covers 2013 through March 27, 2015. This dataset will be updated Quarterly. For more information see http://cookrecorder.com/ .

Residents who do not have access to air conditioning are encouraged to take advantage of cooling centers throughout Cook County.

A complete, historic universe of Cook County parcels with attached geographic, governmental, and spatial data.

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:

• Data is attached via spatial join (st_contains) to each parcel's centroid.


• Centroids are based on Cook County parcel shapefiles.


• Older properties may be missing coordinates and thus also missing attached spatial data (usually they are missing a parcel boundary in the shapefile).


• Newer properties may be missing a mailing or property address, as they need to be assigned one by the postal service.


• Attached spatial data does NOT go all the way back to 1999. It is only available for more recent years, primarily those after 2012.


• The universe contains data for the current tax year, which may not be complete or final. PINs can still be added and removed to the universe up until the Board of Review closes appeals.


• Data will be updated monthly.


• Rowcount and characteristics for a given year are final once the Assessor has certified the assessment roll for all townships.


• Depending on the time of year, some third-party and internal data will be missing for the most recent year. Assessments mailed this year represent values from last year, so this isn't an issue. By the time the Data Department models values for this year, those data will have populated.


• Current property class codes, their levels of assessment, and descriptions can be found on the Assessor's website. Note that class codes details can change across time.


• Due to decrepencies between the systems used by the Assessor and Clerk's offices, tax_district_code is not currently up-to-date in this table.

For more information on the sourcing of attached data and the preparation of this dataset, see the Assessor's data architecture repo on GitLab.

This data set contains characteristic data points used by the Cook County Assessor in the 2021 Chicago reassessment to produce initial estimates of the current market value of most Chicago homes (single-family homes, small multi-family homes, and condo units). You can use the "Filter" option to search for a property's PIN or address, and see what data the Assessor’s Office had about a home’s characteristics at the time of modeling*. To learn more about how the 2021 model used this data, read about our public Residential Automated Valuation Model here. Chicago properties not listed here are reassessed using different modeling procedures.

*Important Note: This dataset is, at the time of publication, an early snapshot of data. Data about a home might change later in the assessment process this year as Assessor’s Office staff and analysts review these properties. After this review, updated characteristics and market values are mailed to homeowners. If the data listed on the assessment notice is incorrect, an appeal can be filed to provide the correct characteristics.

The Parcel 2014 feature contains tax parcel polygons for the 2014 property tax assessment at the County. This feature reflects tax parcel polygons as they existed from 1/1/2014 through 12/31/2014. Each parcel is uniquely identified with a Property Index Number (PIN).

Mortgages recorded with the Cook County Recorder of Deeds. Data covers 2013 through March 27, 2015. This dataset will be updated Quarterly. For more information see http://cookrecorder.com/ .