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. Use the IPUMS data extract system to obtain MLP linked data. The system enables users to create customized data extracts composed of persons linked across any combination of censuses. For most researchers this is the best way to access the linked census data.
Crosswalk: Census to Census. Can be used to link IPUMS full-count census extracts outside of the dissemination system. The principal use of the crosswalk is to provide access to older versions of MLP links, which are not available through the data extract system.
Crosswalk: Social Security to Census. Social Security application and death (Numident) records are linked to the full count censuses for persons who died before 2008. The crosswalk includes the person's month and year of birth and death and the 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.
Restricted Data. Names and other census character string fields are not accessible from the regular IPUMS access system. Users who require names may request access to the restricted version of the data, which requires a special licensing arrangement and associated fee.
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