https://classic.ntis.gov/products/ssa-dmf/
The Social Security Administration’s Death Master File is produced by the Social Security Administration (SSA) and distributed by the National Technical Information Service (NTIS) of the United States Department of Commerce and contains over 85 million records of deaths, reported to the SSA, from 1936 to present. It is available from NTIS through an online search application (developed and hosted by Global Internet Management), as well as raw data files download products (hosted and disseminated by NTIS).