Datasets
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Assessor - Single and Multi-Family Improvement Characteristics
Single and multi-family (less than 7 units) property characteristics collected and maintained by the Assessor's Office for all of Cook County, from 1999 to present. The office... -
Assessor - Parcel Sales
Parcel sales for real property in Cook County, from 1999 to present. The Assessor's Office uses this data in its modeling to estimate the fair market value of unsold properties.... -
Assessor - Historic Assessed Values
Historic 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... -
Assessor - Parcel Universe
A complete, historic universe of Cook County parcels with attached geographic, governmental, and spatial data. Additional notes:Data is attached via spatial join (st_contains)... -
Assessor [Archived 05-18-2022] - Assessment Appeals by Town and Class - 2010
Assessment Appeals by Town and Class from Tax Year 2010. -
Assessor - Neighborhood Boundaries
Neighborhood polygons used by the Cook County Assessor's Office for valuation and reporting. These neighborhoods are specific to the Assessor. They are intended to represent... -
Assessor [Archived 05-18-2022] - Homeowner Exemptions, by Town Number/Township - 2010
Homeowner Exceptions by Town Number/Township in Tax Year 2010. -
Department of Revenue - Unincorporated Cook County Municipalities by Township and ZIP
Data last updated September 8th, 2011 -
Historical - ccgisdata - FPDCC fishing lakes in Cook County
Fishing lakes in Cook County with contours. To view or use these shapefiles, compression software and special GIS software, such as ESRI ArcGIS, is required -
Suburban Cook Election Precincts - Current
Suburban Cook County Election Precincts maintained by the Cook County Clerk's Election Department. Not included are the City of Chicago Election Precincts which are maintained... -
Medical Examiner - Unclaimed Persons
This dataset contains our most up to date list of Unclaimed Persons found in Cook County. If you feel you are the next of kin to any of the individuals listed, Please contact... -
Historical - GIS-Shapefiles of trails in the Cook County Forest Preserves
Trails within the Forest Preserve District of Cook County. To view or use these shapefiles, compression software and special GIS software, such as ESRI ArcGIS, is required. -
Assessor - 2022 Open Data Refresh
A brief outline of the changes users can expect from the Assessor's open data offerings. -
Historical - Cook County Road Construction Points - 2011
Locations of planned Cook County road construction projects for 2011 -
Medical Examiner Case Archive
Effective April 1, 2022, the Cook County Medical Examiner’s Office no longer takes jurisdiction over hospital, nursing home or hospice COVID-19 deaths unless there is another... -
Cook County Check Register - Fiscal Years 2006 through 2013
New check register data can be found at https://datacatalog.cookcountyil.gov/id/gywr-fjeh. This register contains checks from December 2006 through November 2013. This dataset... -
Procurement - Intent to Execute
This dataset provides the list of vendors and contracts to be executed by the Office of the Chief Procurement Officer and is updated 3 days before award. M/W/DBE Participation... -
Historical - Forest Preserve-Cook County Forest Preserve Trails
KML file of trails within the Forest Preserve District of Cook County. To view or use these files, special GIS software such as Google Earth is required