Boundaries for the municipalities that surround Chicago. To view or use these files, compression software and special GIS software, such as ESRI ArcGIS, is required.

2000 Census block boundaries clipped to Chicago. The data can be viewed on the Chicago Data Portal with a web browser. However, to view or use the files outside of a web browser, you will need to use compression software and special GIS software, such as ESRI ArcGIS (shapefile) or Google Earth (KML or KMZ), is required.

Ward precincts, which function as local election districts to determine the polling places for voters, based on their addresses. Precincts are based on U.S. Census Bureau blocks. These precincts were first used for the November 2022 election and first used for Chicago municipal elections in 2023. Neither this description nor the dataset should be relied upon in situations where legal precision is required.

​​​​​This dataset is in a forma​​t for spatial datasets that is inherently tabular but allows for a map as a derived view. Please click the indicated link below for such a map.

To export the data in either tabular or geographic format, please use the Export button on this dataset.

State of Illinois House Congressional boundaries in Chicago. To view or use these files, compression software and special GIS software, such as ESRI ArcGIS, is required

Ward precincts, which function as local election districts, in Chicago. To view or use these files, compression software and special GIS software, such as ESRI ArcGIS, is required. To download, right-click the "Download" link above and choose "Save link as."

Cook County facilities. To view or use these shapefiles, compression software and special GIS software, such as ESRI ArcGIS, is required.

OUTDATED: See similar current data at https://data.cityofchicago.org/d/f4sz-sn2p. --Ward office locations for aldermen. The data can be viewed on the Chicago Data Portal with a web browser. However, to view or use the files outside of a web browser, you will need to use compression software and special GIS software, such as ESRI ArcGIS (shapefile) or Google Earth (KML or KMZ).

Ward precincts, which function as local election districts to determine the polling places for voters, based on their addresses. Precincts are based on U.S. Census Bureau blocks. These precincts were used in 2010.

KML file of cemeteries located in Cook County. To view or use these files, special GIS software such as Google Earth is required.

Aldermanic ward offices overlaid on ward boundaries.

Cemetaries located in Cook County. To view or use these shapefiles, compression software and special GIS software, such as ESRI ArcGIS, is required.

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

OUTDATED. See the current data at https://data.cityofchicago.org/d/htai-wnw4 -- List of alderman, office address, phone number, and website for all 50 Chicago wards. This version of the data was posted 7/2/2013 and stayed live until 7/16/2015, when it was replaced with the list of aldermen inaugurated 5/18/2015, after allowing time for most office space arrangements to be finalized.

Boundaries of Chicago's surrounding municipalities. To view or use these files, special GIS software such as Google Earth is required. To download, right-click the "Download" link above and choose "Save link as."

OUTDATED. See the current data at https://data.cityofchicago.org/d/fwns-qqic -- To view or use these files, compression software and special GIS software, such as ESRI ArcGIS, is required. To download, right-click the "Download" link above and choose "Save link as." This version of the data was posted 8/8/2012 and stayed live until 7/16/2015, when it was replaced with the list of aldermen inaugurated 5/18/2015, after allowing time for most office space arrangements to be finalized.

City boundary of Chicago. The data can be viewed on the Chicago Data Portal with a web browser. However, to view or use the files outside of a web browser, you will need to use compression software and special GIS software, such as ESRI ArcGIS (shapefile) or Google Earth (KML or KMZ).

2010 Census block boundaries clipped to Chicago. The data can be viewed on the Chicago Data Portal with a web browser. However, to view or use the files outside of a web browser, you will need to use compression software and special GIS software, such as ESRI ArcGIS (shapefile) or Google Earth (KML or KMZ), is required.

OUTDATED. See the current data at https://data.cityofchicago.org/d/fwns-qqic -- To view or use these files, special GIS software such as Google Earth is required. To download, right-click the "Download" link above and choose "Save link as." This version of the data was posted 8/8/2012 and stayed live until 7/16/2015, when it was replaced with the list of aldermen inaugurated 5/18/2015, after allowing time for most office space arrangements to be finalized.

2000 Census block boundaries clipped to Chicago. The data can be viewed on the Chicago Data Portal with a web browser. However, to view or use the files outside of a web browser, you will need to use compression software and special GIS software, such as ESRI ArcGIS (shapefile) or Google Earth (KML or KMZ), is required.

Chicago's central business district boundary. The data can be viewed on the Chicago Data Portal with a web browser. However, to view or use the files outside of a web browser, you will need to use compression software and special GIS software, such as ESRI ArcGIS (shapefile) or Google Earth (KML or KMZ).

Ward precincts, which function as local election districts to determine the polling places for voters, based on their addresses. Precincts are based on U.S. Census Bureau blocks. These precincts were first used for the 2012 elections and first used for Chicago municipal elections in 2015.

Census tract boundaries in Chicago. The data can be viewed on the Chicago Data Portal with a web browser. However, to view or use the files outside of a web browser, you will need to use compression software and special GIS software, such as ESRI ArcGIS (shapefile) or Google Earth (KML or KMZ), is required.

Ward boundaries in Chicago from May 2003 to May 2015, corresponding to the dates when a new City Council is sworn in, based on the immediately preceding elections. Neither this description nor the dataset should be relied upon in situations where legal precision is required. The data can be viewed on the Chicago Data Portal with a web browser. However, to view or use the files outside of a web browser, you will need to use compression software and special GIS software, such as ESRI ArcGIS (shapefile) or Google Earth (KML or KMZ), is required.

CTA's statutory service area is defined in the
Metropolitan Transit Authority Act of 1945 (70 ILCS 3605)
as being, "All territory in the County of Cook, State of Illinois,
lying east of the east line of Range Eleven, East of the Third
Prinicipal Meridian of the United States Government Survey..."

OUTDATED: See similar current data at https://data.cityofchicago.org/d/f4sz-sn2p. --Ward office locations for aldermen. The data can be viewed on the Chicago Data Portal with a web browser. However, to view or use the files outside of a web browser, you will need to use compression software and special GIS software, such as ESRI ArcGIS (shapefile) or Google Earth (KML or KMZ).