3 février 2022
United States. Bureau of the Census, « (Restricted) Harmonized Decennial Census », Inter-university Consortium for Political and Social Research, ID : 10.3886/ICPSR37927.v1
The U.S. census counts each resident of the country, where they live on April 1, every ten years ending in zero. Article I, Section 2 of the Constitution mandates the enumeration to determine how to apportion the House of Representatives among the states. The IPUMS collects, preserves and harmonizes census microdata and provides easy access to this data with enhanced documentation. The public-use IPUMS Data includes decennial censuses from 1790 to 2010 and American Community Surveys (ACS) from 2000 to the present. The internal microdata has been harmonized with the same software used to harmonize the public-use microdata. The harmonized internal decennial census microdata files includes a limited set of the most commonly used variables. Future releases will harmonize all variables and also include the parent-child and spouse linking variables available in the harmonized public-use microdata files.