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Chicago ward boundaries from May 2003 to May 2015, corresponding to City Council inauguration dates following elections. The dataset is published by data.cityofchicago.org and includes columns for ward number, alderman name, geometry, and administrative details. It was last updated in March 2026.
Requires special GIS software (e.g., ESRI ArcGIS) to view files outside a web browser. Data is provided in multiple formats including CSV, JSON, XML, and RDF.
| # | Column Name |
|---|---|
| 1 | ADDRESS |
| 2 | SHAPE_LEN |
| 3 | SHAPE_AREA |
| 4 | EDIT_DATE1 |
| 5 | HALL_OFFIC |
| 6 | HALL_PHONE |
| 7 | WARD_PHONE |
| 8 | CLASS |
| 9 |
| ALDERMAN |
| 10 | WARD |
| 11 | PERIMETER |
| 12 | DATA_ADMIN |
| 13 | the_geom |