Assessor [Archived 05-11-2022] - Residential Modeling Characteristics (Chicago)

This data set contains characteristic data points used by the Cook County Assessor in the 2021 Chicago reassessment to produce initial estimates of the current market value of most Chicago homes (single-family homes, small multi-family homes, and condo units). You can use the "Filter" option to search for a property's PIN or address, and see what data the Assessor’s Office had about a home’s characteristics at the time of modeling*. To learn more about how the 2021 model used this data, read about our public Residential Automated Valuation Model here. Chicago properties not listed here are reassessed using different modeling procedures.

*Important Note: This dataset is, at the time of publication, an early snapshot of data. Data about a home might change later in the assessment process this year as Assessor’s Office staff and analysts review these properties. After this review, updated characteristics and market values are mailed to homeowners. If the data listed on the assessment notice is incorrect, an appeal can be filed to provide the correct characteristics.

Data and Resources

Field Value
accessLevel public
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://datacatalog.cookcountyil.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier https://datacatalog.cookcountyil.gov/api/views/8f9d-wy2d
issued 2021-07-20
landingPage https://datacatalog.cookcountyil.gov/d/8f9d-wy2d
modified 2022-05-11
publisher datacatalog.cookcountyil.gov
resource-type Dataset
source_datajson_identifier true
source_hash 60a0c0da877f86eb4bb5690bf2581df7497c14e3
source_schema_version 1.1
theme {"Property & Taxation"}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • archive
  • ckan
  • cook-county-assessor
  • geo
  • geoss
  • national
  • north-america
  • property-tax
  • united-states
isopen False
license_id notspecified
license_title License not specified
maintainer Cook County Assessor's Office Data Department
maintainer_email no-reply@datacatalog.cookcountyil.gov
metadata_created 2025-11-21T06:02:02.537453
metadata_modified 2025-11-21T06:02:02.537457
notes This data set contains characteristic data points used by the Cook County Assessor in the 2021 Chicago reassessment to produce initial estimates of the current market value of most Chicago homes (single-family homes, small multi-family homes, and condo units). You can use the "Filter" option to search for a property's PIN or address, and see what data the Assessor’s Office had about a home’s characteristics at the time of modeling*. To learn more about how the 2021 model used this data, read about our public <a href="https://gitlab.com/ccao-data-science---modeling/models/ccao_res_avm" target=_new>Residential Automated Valuation Model here</a>. Chicago properties not listed here are reassessed using different modeling procedures. <br> <br> <b>*Important Note:</b> This dataset is, at the time of publication, an early snapshot of data. Data about a home might change later in the assessment process this year as Assessor’s Office staff and analysts review these properties. After this review, updated characteristics and market values are mailed to homeowners. If the data listed on the assessment notice is incorrect, an appeal can be filed to provide the correct characteristics.
num_resources 4
num_tags 11
title Assessor [Archived 05-11-2022] - Residential Modeling Characteristics (Chicago)