Cook County Property Assessments and Appeals from 2010 to 2020

Every assessed property value in Cook County from 2010 to 2020 includes three distinct assessment stages per year: CCAO Mailed, CCAO Certified, and Board of Review Certified final values. The data, archived from the Cook County Assessor's office, allows direct comparison of valuations across different government agencies.

Use Cases

• Analyze trends in 'CCAO mailed AV' versus 'BOR certified AV (final)' to measure assessment volatility over the 'Year' column.
• Predict the 'Appeal filed with BOR' indicator using features like 'Tax code', 'Class', and 'CCAO Neighborhood'.
• Identify patterns in 'BOR adjustment indicator' and 'CCAO adjustment indicator' across different 'Township name' regions.
• Model the relationship between 'PIN' characteristics and the occurrence of 'CCAO reviews' over the 10-year time range.

Strengths

• Covers a 10-year time range from 2010 to 2020.
• Includes three distinct assessment stages (CCAO Mailed, CCAO Certified, BOR Certified) for each property-year observation.
• Contains specific appeal and adjustment indicator columns enabling outcome analysis.

Limitations

• Sample size and total row count are unknown, limiting statistical reliability assessments.
• Data is archived as of 2022 and not updated beyond 2020, creating a temporal staleness for current analysis.
• Geographic scope is limited to Cook County, Illinois, which may not be generalizable.

Provenance

Source

datacatalog.cookcountyil.gov, likely the Cook County Assessor's office.

Collection Method

Official government property assessment and appeal records.

Time Range

2010 to 2020.

Freshness

Archived in 2022, with data coverage ending in 2020.

Geography

Cook County, Illinois, USA.