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The full 1938 HOLC Chicago map: 239 graded zones, all 82 Area Descriptions, polygons, and a 2020-tract crosswalk.
Annotated edition of the 1938 HOLC Chicago Residential Security Map. The polygons and area descriptions come directly from the Mapping Inequality project at the University of Richmond; the 2020-tract crosswalk and the six derived indicator files are the Rooted Forward contribution and ship under the matching CC BY-NC-SA license.
The cleaned Rooted Forward replication archive for this paper is in preparation. Until it is released, every record below traces to a public upstream source. These are the same files we draw on, hosted by their primary publishers.
Mapping Inequality · Chicago
Direct GeoJSON and area-description downloads, the canonical source for HOLC Chicago.
https://dsl.richmond.edu/panorama/redlining/cities/IL/Chicago
National Archives Record Group 195 (HOLC)
Original HOLC records, the underlying primary source.
https://catalog.archives.gov/id/720357
Files in the archive
holc-chicago-1938-zones.geojson
All 239 graded zones.
holc-chicago-1938-area-descriptions.csv
All 82 Area Descriptions transcribed.
holc-chicago-2020-tract-crosswalk.csv
Tract-to-zone match with overlap percentages.
holc-chicago-indicators.parquet
Six tract-level outcome indicators 2020 to 2024.
holc-chicago-map-tiles.zip
Vector tiles for self-hosting.
License
The columns and types you can expect once the archive is live. Sample rows are intentionally omitted; we publish only verified records, not synthetic placeholders.
Schema · 4 columns · no sample rows
| Column | Type | Description |
|---|---|---|
| zone_id | text | |
| grade | text | |
| area_description_excerpt | text | |
| matched_2020_tracts | int |
CC BY-NC-SA 4.0 to match Mapping Inequality. Code MIT.