This dataset contains roads under Cook County jurisdiction. The MAINT attribute is "True" for roads maintained by the County

Data last updated 06/19/2015.

The Rivers and Streams data set represents, as a single line, the interpreted midline of flowing water features as seen on the aerial photography.

Annual Tax Sale: A yearly auction of delinquent taxes where a tax buyer (purchaser) pays the delinquent taxes due on a parcel. This results in a lien on the property. The property owner must repay the tax buyer with interest for the amount of the sale – this is known as “redemption.” If redemption does not occur within a set time period, the tax buyer can obtain legal title to the property – this is referred to as a “tax deed.”

Forest Preserve District of Cook County boundaries. To view or use these shapefiles, compression software and special GIS software, such as ESRI ArcGIS, is required.

IL State Senate Districts based on Census 2010

Use the tools at right to find the Cook County Government location or service you need. Click on the icon to see the location name, type, type of service offered, and contact information.

The feature class Right-of-Way indicates tax exempt rights-of-way digitized from recorded plats.

This data is compiled by the Cook County Department of Public Health using data from the Illinois Department of Public Health Vital Statistics. It includes the annual number of deaths, crude and age-adjusted death rates by selected causes of death. Further analysis is available by age group, race/ethnicity, gender and decedent's place of residence in suburban Cook County at the time of their death. Note: Counts suppressed for events between 1 and 4, Rates not calculated for events less than 20

The County's system of tax maps is based on the Illinois Public Land Survey System (PLSS). In the PLSS, each township is divided into 36 sections, and each section into four quarter-sections. A quarter-section is further divided into two tax map sheets, often called "pages". Each tax map (1/4 mile by 1/2 mile) represents the east or west half of one quarter-section, and typically there are eight tax maps per section.