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Assessor - Parcel Universe

Property & Taxation

Dataset

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:

Non-taxing district data is attached via spatial join (st_contains) to each parcel's centroid.

Tax district data (school district, park district, municipality, etc.) are attached by a parcel's assigned tax code.

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.

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.

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 Standard Operating Procedures for Open Data on GitHub.

Read about the Assessor's 2023 Open Data Refresh.

Tags cook county assessor property tax

API Docs

Updated

November 4 2023

Views

1,809

Capital Budget

Finance

Data Provided by cookcounty.data.socrata.com

Filtered View

The capital budget is used to address the critical infrastructure needs of the County from road improvements to technology and the construction of new facilities. Exhaustive criteria is used to identify which capital projects the County will invest in each year and such projects are predominately funded through sources outside of the operating budget like debt issued by the County.

Tags adopted budget capital finance fy2020 and 4 more

API Docs

Updated

November 1 2023

Views

Assessor - Assessed Values

Property & Taxation

Dataset

Land, building, and total assessed values for all Cook County parcels, from 1999 to present. The Assessor's Office uses these values for reporting, evaluating assessment performance over time, and research.

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.

This data is parcel-level. Each row contains the assessed values for a single PIN for a single year. Important notes:

Assessed values are available in three stages: 1) mailed, these are the initial values estimated by the Assessor's Office and mailed to taxpayers. 2) certified, these are values after the Assessor's Office closes appeals. 3) Board of Review certified, these are values after the Board of Review closes appeals.

The values in this data are assessed values, NOT market values. Assessed values must be adjusted by their level of assessment to arrive at market value. Note that levels of assessment have changed throughout the time period covered by this data set.

This data set will be updated roughly contemporaneously (monthly) with the Assessor's website as values are mailed and certified. However, note that there may be small discrepancies between the Assessor's site and this data set, as each pulls from a slightly different system. If you find a discrepancy, please email the Data Department using the contact link below.

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.

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.

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 2023 Open Data Refresh.

Tags cook county assessor property tax

API Docs

Updated

November 1 2023

Views

8,619