Data Availability
The original census enumeration sheets were microfilmed by the Census Bureau in the 1940s; after which the original sheets were destroyed. The microfilmed census is available in rolls from the National Archives and Records Administration. Several organizations also host images of the microfilmed census online, along which digital indices.
Microdata from the 1920 census are freely available through the Integrated Public Use Microdata Series. Aggregate data for small areas, together with electronic boundary files, can be downloaded from the National Historical Geographic Information System.
Read more about this topic: 1920 United States Census
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