Cook County Annual Tax Sale Records with Property and Bid Details

Tax lien sale records from the Cook County Treasurer's Office, required under Illinois law. The data includes property identification, sale year, buyer information, and financial details like winning bid percentage and tax amounts offered. The dataset is hosted by datacatalog.cookcountyil.gov and was last updated on 2026-01-27.

Use Cases

• Analyze geographic patterns of tax delinquency using PIN, location_1 (address), and Township Name.
• Model the relationship between Tax Amount Offered, Penalty Amount Offered, and Winning Bid Percent.
• Track buyer activity and investment concentration across tax sale years using Buyer Name and Tax Sale Year.
• Assess financial outcomes of tax sales by comparing Total Amount Paid, Total Amount Forfeited, and Cost.

Strengths

• Includes detailed financial columns such as Winning Bid Percent, Cost, and Total Tax and Penalty Amount Offered.
• Contains geospatial identifiers like PIN and location_1 fields for address-level analysis.
• Data is provided in multiple machine-readable formats including CSV, JSON, XML, and RDF.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Description metadata is limited; actual data quality requires manual inspection after download.
• Sample data is unavailable for preview.

Provenance

Source

datacatalog.cookcountyil.gov

Collection Method

Administrative records from the Cook County Treasurer's Office Annual Tax Sale.

Time Range

Coverage is implied by the Tax Sale Year column, but specific range is unknown.

Freshness

Last updated 2026-01-27 20:43:09; freshness should be verified.

Geography

Cook County, Illinois, United States, as indicated by township and address columns.