Linked Census Data Access
Linked census data are available through the IPUMS extract system or as crosswalk files that enable users to link IPUMS data on their desktop. We also provide crosswalks that allow researchers to join other types of data to the censuses.
Data Extracts: Census to Census (MLP Version 1.1). Guidance for users to create customized extracts using the IPUMS dissemination system that contain persons MLP has linked across censuses. For most researchers this is the most convenient way to access the linked census data.
Crosswalks: Census to Census (MLP Version 1.2). Can be used to link IPUMS full-count census extracts outside of the dissemination system. Some of the crosswalks — such as the 1940-1950 and 20/30-year census pairings — are composed of links that are not yet incorporated into the data extract system.
Crosswalks: Social Security to Census (MLP Version 1.2). Social Security application and death (Numident) records are linked to the full count censuses for persons who died before 2008. The crosswalks include the person's month and year of birth and death and state in which the social security number was issued.
Crosswalk: World War II Enlistments to 1940 Census. Army enlistment data from 1938 to 1946 are linked to the 1940 Census. Data preparation and linking were performed by the CenSoc project at the University of California at Berkeley. Variables include height, weight, and other information about the enlistee.
MLP Version History. A record of each public release of linked data via the IPUMS extract system and crosswalk files.
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