Cook County GIS Department map of municipal boundaries in Cook Cook County, Illinois in PDF format. Includes major streets, waterbodies, rail, Cook County Forest Preserve, and municipal boundaries.

The Public Land Survey System (PLSS) is the way land in the United States is subdivided, it forms the foundation of Cook County's cadastral system for identifying and locating land records. Tax parcels are identified using township and section notation, in a modified format. The PLSS serves as a way for users to navigate the parcel geodatabase. This PLSS feature data set is intended to correspond to tax pages on the Cook County Tax Maps. They should not be used for measurement or surveyor purposes. In addition, the parcel attributes PINA (area/township) and PINSA (subarea/section) do not necessarily correspond to the PLSS township and section polygon in which a given parcel resides. The PLSS data is modeled as a single composite network coverage that encompasses townships (area), sections (subarea), quarter sections, and half quarter section. Tax map pages, which typically correspond to half quarter sections (in an east-west split), are modeled as a region subclass in the LANDFABRIC layer. If an indigenous people's reserve was present on the tax map, it was digitized to create subpolygons of the half-quarter section, and those polygons were attributed with the name of the reserve. Within this PLSS data set, a half-quarter section is the smallest polygon unit, except in cases where an Indigenous People's Reserve line is present. The cadastral data for Cook County have previously not been digital nor automated. This project is the initial automation for this information. This database was designed to represent a continuous, non-overlapping spatial database accounting for all land area in Cook County.The PLSS is updated as needed.

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.

Polygon vector map data covering city boundaries for Chicago, Illinois, containing 1 feature.

Boundary GIS (Geographic Information System) data is spatial information that delineates the geographic boundaries of specific geographic features..

This data typically includes polygons representing the outlines of these features, along with attributes such as names, codes, and other relevant information.

Boundary GIS data is used for a variety of purposes across multiple industries, including urban planning, environmental management, public health, transportation, and business analysis.

Available for viewing and sharing as a map in a Koordinates map viewer. This data is also available for export to DWG for CAD, PDF, KML, CSV, and GIS data formats, including Shapefile, MapInfo, and Geodatabase.

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Cook County GIS Dept map of Commissioner District 12

Cook County GIS Dept map of Commissioner District 14

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 found on the Assessor's GitHub. Read about the Assessor's 2025 Open Data Refresh.

Cook County GIS Dept map of Cook County Facilities in PDF format. The map shows all public Cook County Facilities, municipalities, Cook County highway jurisdiction, Cook County Commissioner Districts, major streets, highways, and water bodies.

Cook County GIS Dept map of Commissioner District 4

A map highlighting damage to the Cedar Rapids, IA, area from the August 10, 2020, Midwest Derecho event. Polygons showing maximum estimated wind gusts. Points showing specific areas of damage and estimated wind speeds.Point locations are from National Weather Service damage surveys or information shared with the National Weather Service after the event. Polygon wind contours represent an estimate of maximum wind gusts produced using a combination of weather station observations, damage reports, and storm surveys.This map is used by the August 10, 2020, Midwest Derecho story map:https://storymaps.arcgis.com/stories/f98352e2153b4865b99ba53b86021b65/

This dataset is no longer maintained. For current geographic data about Cook County Forest Preserves, we recommend this site.

KML file of Forest Preserve District of Cook County boundaries. To view or use these files, special GIS software such as Google Earth is required

Shapefile showing boundaries of townships in 1851. Features based upon modern GIS maps of township boundaries and then adjusted to match information from Flower and Mendel's 1861 property map of Cook County, Illinois.

Cook County GIS Dept map of Commissioner District 3.

Cook County GIS Dept map of Commissioner District 8

Cook County GIS Dept map of Commissioner District 10

Cook County GIS Dept map of Commissioner District 11

Cook County GIS Dept map of Rich Township in a pdf format. Includes streets and municipalities.

Cook County GIS Dept map of Lake View, North & West Townships in a pdf format. Includes streets and municipalities.

Cook County GIS Dept map of Palatine Township in a pdf format. Includes streets and municipalities.

Board of Review District based on 2010 census.

Splitgraph serves as an HTTP API that lets you run SQL queries directly on this data to power Web applications. For example:

See the Splitgraph documentation for more information.