Are you tracing the family history of someone who lived in the U.S. during the 20th century? Check out a wonderful free database in the United States called the Social 
Security Death Index, or the SSDI. Keep reading for 5 FREE online sources for the SSDI, 7 tips for searching the SSDI and what you can do with SSDI info.
In 1935 the Social Security Act was signed into law by President Franklin Roosevelt, and consequently more than thirty million Americans were registered by 1937. Today, the Death Master File from the Social Security Administration contains over 89 million records of deaths that have been reported to the Social Security Administration and they are publicly available online.
Most of the information included in the index dates from 1962, although some data is from as early as 1937. This is because the Social Security Administration began to use a computer database for processing requests for benefits in 1962. Many of the earlier records back to 1937 have not been added.
The SSDI does not have a death record for everyone; and occasionally you may find an error here and there if something was reported inaccurately, but overall it’s a terrific resource! It’s especially great for many people who were missed in the 1890 census or whose birth predated vital records registration in their home state. Remember they just needed to live past 1937 and to have worked to have been included. So they could have been born sometime in the later 1800s.
5 FREE Online Sources for the SSDI
Several genealogy websites provide free access to the SSDI, including (click to go right to the SSDI at these sites):
On the Search page, enter your relative’s name and other details you’re asked for. Hopefully you will get back results that includes your relative!
7 Tips for Searching the SSDI
If your relative doesn’t show up in the SSDI, even though you know they worked after 1937 and you know they have passed away, try these search tips:
1. Does the website you are using to search the SSDI have the most current version available? Look in the database description on the site to see how recently it was updated. Try searching at other sites.
2. Make sure that you tried alternate spellings for their name. You never know how it might have been typed into the SSDI database.
3. Many SSDI indexes allow you to use wildcards in your search. So for example you could type in “Pat*” which would pull up any name that has the first three letters as PAT such as Patrick, Patricia, etc.
4. Try using less information in your search. Maybe one of the details you’ve been including is different in the SSDI database. For example it may ask for state and you enter California because that’s where grandpa died, when they were looking for Oklahoma because that’s where he first applied for his social security card. By leaving off the state you’ll get more results. Or leave off the birth year because even though you know it’s correct, it may have been recorded incorrectly in the SSDI and therefore it’s preventing your ancestor from appearing in the search results.
5. Leave out the middle name because middle names are not usually included in the database. However, if you don’t have luck with their given name, try searching the middle name as their given name. In the case of my grandfather his given name was Robert but he went by the initial J.B. But in the SSDI his name is spelled out as JAY BEE!
6. Remember that married women will most likely be listed under their married surname, not their maiden name. But if you strike out with the married name, go ahead and give the maiden a try. She may have applied for her card when single, and never bothered to update the Administration’s records. Or if she was married more than once, check all her married names for the same reason.
7. Don’t include the zip code if there is a search field for it because zip codes did not appear in earlier records.
While most folks will appear in the SSDI, there are those who just won’t. But knowing where information is not located can be as important down the road in your research as knowing where it IS located, so I recommend making a note in your database that you did search the SSDI with no result. This will save you from duplicating the effort down the road because you forgot that you looked there.
What You Can Do with SSDI Information
Now, here comes the most exciting part of the SSDI: what you can do with that information. First, it usually includes a death date (at least the month and year) and sometimes a state and last known residence. Use this information to look for death records, obituaries, cemetery and funeral records. And use that Social Security Number to order a copy of your relative’s application for that number: the SS-5. Click here to read more about the SS-5 and how to order it.
Up next, read:
Get Started: How to Find Your Family History for Free
7 Great Ways to Use Your iPad for Family History
