Cook County Parcel Addresses with Owner and Taxpayer Information

Situs and mailing addresses for Cook County parcels, used by the Assessor's office to mail assessment notices. The dataset includes both owner and taxpayer information and was updated in March 2026. Data is updated monthly and maintained by the Cook County Assessor's office.

Use Cases

• Link property locations to owner information using pin, property_address, and owner_name columns.
• Validate or standardize mailing addresses for tax notices using mailing_address, mailing_city, and mailing_zip columns.
• Analyze geographic distribution of property ownership using pin10, owner_city, and owner_state columns.
• Join with other Cook County property datasets using the zero-padded 14-digit Parcel Index Number (pin) as a key.

Strengths

• Includes both owner and taxpayer information across 18 columns.
• Data is updated monthly, with a last update timestamp of 2026-04-15 11:49:31.
• Provides clear guidance on PIN formatting and links to related Parcel Sales data for owner name queries.

Limitations

• Owner name and mailing address information is only intermittently updated in the source system.
• Newer properties may be missing a mailing or property address.
• The total row count for the dataset is unknown.

Provenance

Source

Cook County Assessor's office via datacatalog.cookcountyil.gov.

Collection Method

Sourced from the Assessor's office systems; preparation follows documented Standard Operating Procedures for Open Data.

Freshness

Updated monthly; last updated 2026-04-15 11:49:31.

Geography

Cook County, Illinois, USA.