Cook County Parcel Addresses with Owner and Taxpayer Information

Cook County, Illinois parcel addresses for mailing assessment notices. The dataset includes both owner and taxpayer information and was updated in March 2026. Data is updated monthly by the Cook County Assessor's office.

Use Cases

• Mail property tax assessment notices based on parcel mailing addresses.
• Link property ownership records based on owner and taxpayer information.
• Geocode parcels for spatial analysis based on property (situs) addresses.
• Validate and clean Parcel Index Numbers (PINs) by ensuring 14-digit zero-padding.

Strengths

• Includes both owner and taxpayer information as of a March 2026 update.
• Data is updated monthly, suggesting regular maintenance.
• Linked to Parcel Sales data for querying owner and seller names.

Limitations

• Owner name and mailing address are only intermittently updated in the source data.
• Newer properties may be missing assigned mailing or property addresses.
• Column-level documentation is absent; field semantics must be inferred after download.

Provenance

Source

Cook County Assessor's office.

Collection Method

Sourced from the Assessor's office systems for mailing assessment notices.

Time Range

Current year, with monthly updates.

Freshness

Updated monthly; last updated 2026-04 12 05:35:55.965103.

Geography

Cook County, Illinois, USA.