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County
Assessor - Commercial Valuation Data 13 recent views
Cook County of Illinois —
This is a preliminary version of a new open data asset and will be updated later this year once the Assessor's Office has finished reassessing commercial properties,... -
County
Assessor [Archived 05-11-2022] - Residential Sales Data
Cook County of Illinois —
This is the data set of residential sales used by the Cook County Assessor in their Computer Assisted Mass Appraisal system used to assess residential property... -
County
Assessor - Parcel Universe
Cook County of Illinois —
A complete, historic universe of Cook County parcels with attached geographic, governmental, and spatial data. When working with Parcel Index Numbers (PINs) make sure... -
County
Assessor [Archived 05-11-2022] - Property Locations
Cook County of Illinois —
This data set includes property locations and attached spatial data for all Cook County parcels. Spatial matching was based on parcel centroids. Older properties may... -
County
Assessor [Archived 05-11-2022] - Experimental Single Family Sales Comparables
Cook County of Illinois —
A data set showing algorithmically determined sales comparables for single family properties in Lake Township -
County
Assessor - Residential Condominium Unit Characteristics
Cook County of Illinois —
Residential condominium unit characteristics collected and maintained by the Assessor's office for all of Cook County, from 1999 to present. The office uses this data... -
County
Assessor [Archived 05-11-2022] - Residential Exemption Amounts
Cook County of Illinois —
This data displays total exempt EAV and total exemptions by tax code. Since residential exemptions reveal sensitive information about individual taxpayers and... -
County
Assessor [Archived 05-11-2022] - Residential Neighborhood Boundaries
Cook County of Illinois —
Neighborhoods play an important role in residential property assessment. Single-family and residential multi-family property assessments are sensitive to neighborhood... -
County
Assessor - Parcel Addresses
Cook County of Illinois —
Situs and mailing addresses of Cook County parcels. Used by the Assessor's office to mail assessment notices. As of 2017 mailing addresses in this dataset are no... -
County
Assessor [Archived 05-31-2023] - Parcel Universe
Cook County of Illinois —
A complete, historic universe of Cook County parcels with attached geographic, governmental, and spatial data. When working with Parcel Index Numbers (PINs) make sure... -
County
Assessor - Assessed Values
Cook County of Illinois —
Land, building, and total assessed values for all Cook County parcels, from 1999 to present. The Assessor's Office uses these values for reporting, evaluating... -
County
Assessor - 2022 Open Data Refresh
Cook County of Illinois —
A brief outline of the changes users can expect from the Assessor's open data offerings. -
County
Assessor [Archived 05-11-2022] - Residential COVID Adjustment Replication Data
Cook County of Illinois —
In response to the 2020 COVID-19 pandemic and its anticipated effects on the residential real estate market, the Cook County Assessor will adjust residential... -
County
Assessor [Archived 05-18-2022] - Assessment Appeals by Town and Class - 2010
Cook County of Illinois —
Assessment Appeals by Town and Class from Tax Year 2010. -
County
Assessor [Archived 05-18-2022] - Residential Assessments
Cook County of Illinois —
This data contains every residential Property Index Number (PIN) and corresponding Assessed Values from significant stages in the assessment process. This data was... -
County
Assessor [Archived 05-11-2022] - Residential Modeling Characteristics (Chicago)
Cook County of Illinois —
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... -
County
Assessor [Archived 05-11-2022] - Residential Property Characteristics
Cook County of Illinois —
Assessment dataset used by the Cook County Assessor in their Computer Assisted Mass Appraisal (CAMA) system used to assess residential properties in Northern... -
County
Assessor [Archived 05-18-2022] - Homeowner Exemptions, by Town Number/Township - 2010
Cook County of Illinois —
Homeowner Exceptions by Town Number/Township in Tax Year 2010. -
County
Assessor [Archived 05-11-2022] - Cook County Property Assessments
Cook County of Illinois —
Every assessed value in Cook County 2010 to 2020, and appeal indicators. Each PIN has three stages of assessments each year: CCAO Mailed, CCAO Certified, and Board of... -
County
Assessor - 2023 Open Data Refresh
Cook County of Illinois —
A brief outline of the changes users can expect from the Assessor's open data offerings.