The Social Security Administration (SSA) Death Master File (DMF), often erroneously called the Social Security master death file, is comprised of more than sixty-five million records of deceased individuals who received SSA payments during their lifetime. The DMF includes data such as the deceased's name, social security number, birth date, death date, state, country, and last known zip code. Not every deceased person is included in the DMF, which is why the SSA does not verify the accuracy of its files. Therefore, the fact that a person is not included in these files is not to be considered absolute proof that this person is still living. If you must accurately identify an individual as deceased, contact a reputable social security attorney. While the DMF is not available for viewing online through the SSA, a subscription-based service offered by the United States Departments of Commerce's National Technical Information Service (NTIS) makes online queries available.