Current community area 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.

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.

ZIP Code 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).

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).

Neighborhood boundaries in Chicago, as developed by the Office of Tourism. These boundaries are approximate and names are not official. To view or use these files, compression software and special GIS software, such as ESRI ArcGIS, is required.

Ward boundaries in Chicago from May 2015 onward, 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).

Neighborhood boundaries in Chicago, as developed by the Office of Tourism. These boundaries are approximate and names are not official. 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 2012 elections and first used for Chicago municipal elections in 2015.

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).

List of alderman, office address, phone number, and website for all 50 Chicago wards.

Population estimates by the U.S. Census Bureau by U.S. Census Block.

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.

City boundary of Chicago in shapefile format. This dataset has been superseded by https://data.cityofchicago.org/d/ewy2-6yfk, which is in a more flexible format that still allows shapefile downloads. Please use that dataset instead.

KML file of neighborhood boundaries in Chicago, as developed by the Office of Tourism. These boundaries are approximate and names are not official. To view or use these files, special GIS software, such as Google Earth, 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."

U.S. Congressional district boundaries in Chicago. To view or use these files, compression software and special GIS software, such as ESRI ArcGIS, is required

List of alderman, office address, phone number, and website for all 50 Chicago wards.

Chicago sites that offer free or affordable technology resources and services, like computers with Internet access, Wi-Fi hotspots and technology training. Call or visit the organization's website before going to the location. For more information, visit http://locations.weconnectchicago.org/.

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.

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

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.

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.

KML file of boundary for the city of Chicago. To view or use these files, special GIS software, such as Google Earth, is required.

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

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..."