All States (National)
2020 Census Block Crosswalk Data

Crosswalks between 2020 Census block geography and older Census geography, as well as certain data fields reaggregated to the 2020 blocks and rounded to whole numbers. The Census provides crosswalks between 2010 and 2020 block geography (https://www.census.gov/geographies/reference-files/time-series/geo/relationship-files.html), but the only measure that is given of what share of a 2010 block belongs to a 2020 block in the case of a split is area. Broadly speaking, the files on this dataverse were made using the method outlined in our (Brian Amos and Michael McDonald) 2017 paper in Public Opinion Quarterly entitled “When Boundaries Collide: Constructing a National Database of Demographic and Voting Statistics,” where the National Land Cover Database is used to better predict where people live in the case of a split block. See readme.txt for more details, as well as licensing and warranty information.

Dataset Provider

Brian Amos and Michael McDonald

Election Lab Data Publishing

First published June 26, 2023

Last data update April 24, 2021

File Citation

Amos, Brian, 2021, “2020 Census Block Crosswalk Data”, https://doi.org/10.7910/DVN/T9VMJO, Harvard Dataverse, V2

Data

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Data and sourcing information

File Type: TXT

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Amos, McDonald, and Watkins' "When Boundaries Collide," 2017 POQ. Explains methodology of using land cover data to estimate block splits

File Type: PDF

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2019 citizen voting-age population estimates (ACS)