On August 12, 2021 the US Census Bureau released the first detailed results of the 2020 census in accordance with Public Law 94-171, commonly referred to as the redistricting data. The release includes detailed demographics, updated maps, and other documentation and variables.
This repository takes a look at the results as they relate to Chicago and the region, and comparing the 2020 results to past vintages.
The PL94-171 release will not be available through normal API access initially. The links for PL-171 and other sources are listed below the articles.
Contains highlights, links to apps, census maps, etc:
https://www.census.gov/newsroom/press-releases/2021/population-changes-nations-diversity.html
The diversity index is based on work that began in 2015 and was tested in 2018. The US has gotten more diverse in general, but individual regions vary widely in their predominant racial makeup and level of diversity. The article contains county level maps that show how diversity varies around the US, and other visualizations.
Details and the equation to calculate the Census Bureau's Diversity Index can be found in this project here: data/RAW/DOCUMENTATION/Diversity Index Equation.pdf (this was obtained by request, it's not online from the Bureau directly, yet.)
https://www.census.gov/programs-surveys/decennial-census/about/rdo/summary-files.html
The main page has:
- tabular data sources (population variables)
- detailed documentation
- faq documentation
- links to map data
- links to crosswalks
- sample code (R, SAS, Access)
The raw 2020 demograhic data for IL can be found here. This file contains every variable at every available summary level for example State, County, Tract, Blockgroup, Block.
https://www2.census.gov/programs-surveys/decennial/2020/data/01-Redistricting_File--PL_94-171/Illinois/
Descriptions of variables and their groups:
https://www2.census.gov/programs-surveys/decennial/2020/technical-documentation/complete-tech-docs/summary-file/2020Census_PL94_171Redistricting_StatesTechDoc_English.pdf
The raw has been copied here: data/RAW/PL94-171-2020-ILLINOIS/il2020.pl.zip.
The scripts to process the raw population are here:
data/CACHE/il2020.pl_COMBINE.R- unzip a local copydata/CACHE/il2020.pl_COMBINED_FILTER.R- Create useful subsets
Useful subsets for PL-94-171 for the vintages 2020, 2010, and 2000 have been saved in ./data. This directory also contains a data dictionary and variable documentation.
Links and notes from redistricting landing page:
TIGER Line Shapefiles
Use the 2020 Tab of the linked page.
https://www.census.gov/geographies/mapping-files/time-series/geo/tiger-line-file.html
Block Assignment Files (BAFs):
Use the 2020 Tab of the linked page. BAFs are meant to be used in conjunction with the NLTs.
https://www.census.gov/geographies/reference-files/time-series/geo/block-assignment-files.html
Name Look-up Tables (NLTs):
Use the 2020 Tab of the linked page. NLTs are meant to be used in conjunction with the BAFs.
https://www.census.gov/geographies/reference-files/time-series/geo/name-lookup-tables.html
2010 to 2020 Tabulation Block Crosswalk Tables
Use the 2020 Tab of the linked page. Select Block Relationship Files.
https://www.census.gov/geographies/reference-files/time-series/geo/relationship-files.html
State tract map copied here:
data/tl_2020_17_tract - tract boundaries
Historical maps for 2000 and 2010:
https://www2.census.gov/geo/tiger/TIGER2010/TRACT/2000/tl_2010_17_tract00.zip
https://www2.census.gov/geo/tiger/TIGER2010/TRACT/2010/tl_2010_17_tract10.zip
https://www2.census.gov/geo/tiger/TIGER2010/TRACT/2000/tl_2010_17013_tract00.zip
https://www2.census.gov/geo/tiger/TIGER2010/TRACT/2010/tl_2010_17013_tract10.zip
files copied to data/RAW/MAPS, unzipped to data
This link can access pages with map data for roads, parks, correctional facilities, colleges, military facilities, cities, etc. https://tigerweb.geo.census.gov/tigerwebmain/TIGERweb_nation_based_files.html
TIGER Map data download selector. The drop down menu allows access by year, geography, and data types: https://www.census.gov/cgi-bin/geo/shapefiles/index.php
Navigable folder to find shapefiles: https://www2.census.gov/geo/tiger/TIGER2020PL/LAYER/COUNTY/2020/ (this example is county level files for 2020 PL)
Several county level maps and geographic data files can be found at this link, but they are also copied into this repository for incorporation with the project.
https://www2.census.gov/geo/tiger/TIGER2020PL/STATE/17_ILLINOIS/17031/
data/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_addr.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_addrfn.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_arealm.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_areawater.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_bg10.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_bg20.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_cousub10.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_cousub20.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_edges.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_faces.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_facesah.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_facesal.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_featnames.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_linearwater.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_pointlm.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_roads.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_tabblock10.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_tabblock20.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_tract10.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_tract20.zipdata/RAW/MAPS/TL_2020_17031_COOK/tl_2020_17031_vtd20.zip