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.

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.

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.

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

The Public Land Survey System (PLSS) 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 in the Cook County Assessor's Tax Map book (current as of tax year 2000 for 66% of the County and as of tax year 2001 for the remaining 33% of the County), and 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.

Cook County GIS Dept map of Commissioner District 13

Cook County GIS Dept map of Commissioner District 9

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.

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.

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

Cook County GIS Dept map of Commissioner District 14

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

Right-of-Way boundaries in Cook County, Illinois include rights-of-way for roads, railroads, and utilities. The feature class Right-of-Way indicates tax exempt rights-of-way digitized from recorded plats. From Clerk Tax Services 2018 data.

Cook County GIS Department map of Cook County Commissioner Districts in PDF format. Includes major streets, waterbodies, rail, and Cook County Commissioner District boundaries.

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

Cook County GIS Dept map of Calumet, Hyde Park and Lake Townships in a pdf format. Includes streets and municipalities.

Cook County GIS Department map of Cook County Commissioner District 3 in PDF format. Includes major streets, waterbodies, rail, and Cook County Commissioner District boundaries.

Cook County GIS Dept map of Commissioner District 3.

Cook County GIS Dept map of Commissioner District 11

Cook County GIS Department map of Cook County Commissioner District 12 in PDF format. Includes major streets, waterbodies, rail, and Cook County Commissioner District boundaries.