Cook County Parcel Data with Geographic and Tax District Attributes

A current-year universe of Cook County parcels includes geographic, governmental, and spatial data. The dataset is updated monthly and contains data for the current tax year, which may not yet be final. Row and column counts are not specified.

Use Cases

• Analyze property tax district assignments using the tax_district_code and compare with spatial municipality records.
• Attach non-taxing district data to parcels via spatial join (st_contains) using parcel centroids.
• Join parcel-level municipality data from tax records and spatial boundaries to identify discrepancies.
• Investigate missing geographic coordinates for older properties and missing addresses for newer properties.

Strengths

• Data is updated monthly, providing regular refreshes.
• Includes both geographic (centroid-based) and governmental (tax code-based) data attachments.
• Documentation links to source shapefiles and standard operating procedures are provided.

Limitations

• The tax_district_code is not currently up-to-date due to system discrepancies.
• Older properties may be missing coordinates and attached spatial data.
• Some third-party and internal data may be missing for the most recent year depending on the time of year.

Provenance

Source

Cook County Assessor and Cook County Clerk.

Collection Method

Parcel data with attached geographic and tax district information via spatial joins and tax code assignments.

Time Range

Current tax year only.

Freshness

Updated monthly; last updated 2026-03-08.

Geography

Cook County, Illinois.