288 datasets

Open Data Portal for Cook County Government2025 · dataset

This dataset is sourced from the Illinois Department of Public Health and curated by the Cook County Department of Public Health. It covers a select set of causes of death across the County (excluding Chicago). To maintain confidentiality of individual medical records, counts below 5 and rates below 20 are masked with an asterisk (*). Please review metadata and values carefully and exercise cautio

Open Data Portal for Cook County Government2025 · dataset

This dataset is part of a series of seven datasets about Cook County births sourced from the Illinois Department of Public Health and curated by the Cook County Department of Public Health. This dataset includes counts and rates across method of delivery for the County (excluding Chicago). The full data series is as follows: 1) Birth and Fertility 2) Birth Outcomes 3) Characteristics of Delivery 4

Open Data Portal for Cook County Government2025 · dataset

This dataset is part of a series of seven datasets about Cook County births sourced from the Illinois Department of Public Health and curated by the Cook County Department of Public Health. This dataset includes general fertility and birth data across the County (excluding Chicago). The full data series is as follows: 1) Birth and Fertility 2) Birth Outcomes 3) Characteristics of Delivery 4) Infan

Open Data Portal for Cook County Government2025 · dataset

This dataset is part of a series of seven datasets about Cook County births sourced from the Illinois Department of Public Health and curated by the Cook County Department of Public Health. This dataset includes counts and rates of mothers who initiated breastfeeding during their hospital stay across the County (excluding Chicago). The full data series is as follows: 1) Birth and Fertility 2) Birt

Open Data Portal for Cook County Government2025 · dataset

This dataset is part of a series of seven datasets about Cook County births sourced from the Illinois Department of Public Health and curated by the Cook County Department of Public Health. This dataset includes physical health and wellness factors for people who gave birth across the County (excluding Chicago). The full data series is as follows: 1) Birth and Fertility 2) Birth Outcomes 3) Charac

Open Data Portal for Cook County Government2025 · dataset

A reference table indicating what actions require a user to have an Open Data account to complete.

Open Data Portal for Cook County Government2025 · dataset

As a public agency, the Office of the Chief Procurement Officer welcomes all vendors to participate in the open and competitive process. The buying plan contains hundreds of great opportunities for vendors to do business with Cook County. The buying plan includes information on numerous County projects and needs. You will find useful information on the department requesting proposals, project desc

Open Data Portal for Cook County Government2025 · dataset

Quarterly STAR Data Sec. 2-932. - Quarterly Submissions to President and Board Each County Department and Agency shall prepare a Quarterly Record wherein it shall define its mission and establish measurable goals specific and measurable performance indicators, with corresponding performance objectives and targets

Open Data Portal for Cook County Government2025 · dataset

This dataset includes information for Zoning Board of Appeals (ZBA) public hearings. Regularly scheduled ZBA meetings are open to the public and may be attended in person or online. For more information on how to attend, click an agenda. Minutes for each meeting are approved at the following meeting and will be posted upon approval.

Open Data Portal for Cook County Government2025 · dataset

A current-year-only universe of Cook County parcels with attached geographic, governmental, and spatial data. When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded. Additional notes: Non-taxing district data is attached via spatial join (st_contains) to each parcel's centroid. Tax district data (school d

Open Data Portal for Cook County Government2024 · dataset

Historical permit data submitted by municipalities to the Cook County Assessor's Office. When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded. Additional notes: Almost all of the data in this dataset, such as address, estimated date of completion, work description, and permit amount, is data submitted b

Open Data Portal for Cook County Government2024 · dataset

Under Cook County Ethics Code Section 2-585, campaign contributions to County elected officials are limited to $1,500 per calendar year if the contributor is currently doing or has done business with the County. The term "doing business" or "done business" is defined at "any one or any combination of sales, purchases, leases, or contracts to, from, or with the County or any County agency in excess

Open Data Portal for Cook County Government2023 · dataset

Parcels with property tax-exempt status across all of Cook County per tax year, from Tax Year 2022 on, with geographic coordinates and addresses. Properties of religious, charitable, and educational organizations, as well as units of federal, state and local governments, can be eligible for exemption from property taxes. The Illinois Department of Revenue (IDOR) ultimately grants qualified organiz

Open Data Portal for Cook County Government2023 · dataset

Commercial valuation data collected and maintained by the Cook County Assessor's Office, from 2021 to present. The office uses this data primarily for valuation and reporting. This dataset consolidates the individual Excel workbooks available on the Assessor's website into a single shared format. Properties are valued using similar valuation methods within each model group, per township, per year

Open Data Portal for Cook County Government2023 · dataset

Cook County 10-digit parcels with attached distances to various spatial features. When working with 10-digit Parcel Index Numbers (PINs) make sure to zero-pad them to 10 digits. Some datasets may lose leading zeros for PINs when downloaded. 10-digit PINs do not identify individual condominium units. Additional notes: Centroids are based on Cook County parcel shapefiles . Older properties may be mi

Open Data Portal for Cook County Government2023 · dataset

Situs and mailing addresses of Cook County parcels. Used by the Assessor's office to mail assessment notices. This dataset was updated in March 2026 to include both owner and taxpayer information. Please note that owner name and mailing address is, to our knowledge, only intermittently updated in the ias source data. Users can use Parcel Sales data to query owner and seller names. When working wit

Open Data Portal for Cook County Government2023 · dataset

A complete, historic universe of Cook County parcels with attached geographic, governmental, and spatial data. When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded. Additional notes: Non-taxing district data is attached via spatial join (st_contains) to each parcel's centroid. Tax district data (school

Open Data Portal for Cook County Government2023 · dataset

Appeals for many years are currently missing from this dataset as we repopulate our system of record with updated records. We expect all missing appeals to be available again before the end of 2025. To the best of our knowledge, appeals from 2021 and after should continue to remain available throughout the update process. Land, building, and total assessed values, pre and post-appeal with the Cook

Open Data Portal for Cook County Government2022 · dataset

Historic land, building, and total assessed values for all Cook County parcels appealed with the Board of Review, from 2010 to present. The Board of Review uses these values for reporting, evaluating assessment performance over time, and research. When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded Thi

Open Data Portal for Cook County Government2022 · dataset

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 assessment performance over time, and research. When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded. This data is parcel-level. Each row contain

Open Data Portal for Cook County Government2022 · dataset

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 homogenous housing submarkets, NOT Chicago community areas or municipalities. These neighborhoods were reconstructed from individual parcels using spatial buffering and simplification. The full transformation script can be fou

Open Data Portal for Cook County Government2022 · dataset

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 primarily for valuation, assessments, and reporting. When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded. This data is unit-level. Each

Open Data Portal for Cook County Government2022 · dataset

This dataset contains address points for addresses in Cook County. An ESRI Service is available at: https://hub-cookcountyil.opendata.arcgis.com/datasets/5ec856ded93e4f85b3f6e1bc027a2472_0/ Data is updated and maintained by Cook County GIS.

Open Data Portal for Cook County Government2022 · dataset

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 by the Chicago Board Of Elections. An ArcGIS Service is available at: https://hub-cookcountyil.opendata.arcgis.com/datasets/0e91b48d49744346be343f0cb99d25bd_0/ Voting District Project of the Census Redistricting Data Program

Open Data Portal for Cook County Government2022 · dataset

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 uses this data primarily for valuation and reporting. When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded. Current property cla