The CenSoc team, led by Joshua Goldstein at the University of California, Berkeley, is pleased to announce the first public release of CenSoc individual-level administrative data for the study of mortality disparities. The CenSoc project links the 1940 U.S. Census to mortality records from several administrative sources. The first is the Death Master File (CenSoc-DMF), a collection of over 83 million death records reported to the Social Security Administration, resulting in a matched data set of about 5.7 million cases, currently men only. The second is the Social Security Numident File (CenSoc-Numident), a public release by the National Archives, of nearly 50 million death records and corresponding SS-5 Social Security applications, resulting in 6.8 million matches of men and women. The third data set is the Berkeley Unified Numident Mortality Database (BUNMD), a stand-alone data set based on the Numident records consisting of over 49 million men and women with zipcode-level geographic detail.  To learn more about the project and how to download the data, visit censoc.berkeley.edu.