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How Genealogists Can Get the Most From Researching the 1940 U.S. Census

Updated on January 24, 2016

1940 U.S. Census is an Important Genealogy Database

On 2nd of April 2012, there was much rejoicing among family historians and professional genealogist. It was the day the 1940 United States Federal Census was released to the public.

Each census becomes available 72 years after it was enumerated. The 1930 U.S. Federal Census was released back in 2002. For many genealogists that census gave them the first peek at their grandparents in census records. The 1940 Census is the first to give them a glimpse at their parents.

Though some genealogists aren't that thrilled about the 1940 Census, I am! I had many nagging questions such as cousins I could not attach to the tree, missing children for couples, and a lost great grandfather.

Will the 1940 Census be important to your research? Only time will tell. So, let's get ready to make the most of our research experience! It's time for the fun to begin!

[Photo courtesy of: Valeriy Khromov at under the RF-LL License.]

This is what the actual sheet looks like.
This is what the actual sheet looks like. | Source

Free Access the 1940 U.S. Census

The 1940 U.S. Federal Census was released to the public on the 2nd of April 2012. The census is online at various genealogy websites and available at the NARA and other research facilities.

The good news is that you can research it for free. is the first place you should stop to use the census for free. Even better news is that the census is fully indexed. So, if you weren't overly eager like me, you can now take advantage of the available indexes.

Census Research

Finding Answers in U.S. Census Records
Finding Answers in U.S. Census Records
You can learn quite a lot about your ancestors from the census. In order to get the most of your research, you need to understand what questions were asked and how they were asked.

It Wasn't Easy Promoting the Census

This is an informative video preparing the public for the upcoming census. It shows how the government went about promoting the 1940 Census to the masses. This newsreel provides historical information on the U.S. Federal censuses and strikes a patriotic them to encourage people to participate. People have always been suspicious of census enumerators and one of the goals of this newsreel was to make people feel at ease when the enumerator knocked on their door.

It must have been a challenge getting information to the people in those days. If one didn't go to the movies, buy a newspaper, or listen to the radio, word of mouth and posters were the only other means of finding out about things.

1940 Census Promotional Video

Preparing for Your Research Adventure: Making a List

It's always good to start with a research plan. Even with indexes, duplicate names and misspellings can be befuddling.

Before you get started, make a list of who you want to search for. Set your list up in a spreadsheet. Then you can sort it by address (to work within enumeration districts) and by name (when indexes become available).

The better organized you are before you start, the easier your research will be.

You Need to Make a List of What You Know

  1. Full Name of person you want to research.
  2. Age at last birthday (not the age they will be in 1940)
  3. Name variations. Census enumerators did a great job of mangling names. Make a notation of the variations you have already found so you can look for those if you do not find your ancestor under the right name.
  4. Where they lived. This should be as complete as you can get. Knowing the town name may be enough for a small area, but it won't be enough for a larger city. You should know the street name at the very least.
  5. Names of anyone else living in the household. Note the spouse, children, and any other people who might be living in this household at the time of the census.
  6. Names of other relatives who might be living in the same area. Family tended to flock together during this era. You may find that several relatives lived on the same street or in the same part of town. Finding one may help find the others.

Have you researched in the 1940 Census?

See results

You Need to Know Where They Lived in 1940

I know that it sounds like a great idea to just start plugging names into a search engine and see where it leads. But, many a researcher becomes frustrated because they don't really know where to find their ancestors. While indexes exist, it may be difficult to know which families in two different counties (or states) are yours.

There are several resources you can check to find their address.

  • The 1930 U.S. Census-if your ancestors stayed put, chances are their address will remain the same from 1930 to 1940.
  • City Directories-If you know what city your ancestors lived in, you can search through city directories to find the exact address.
  • Birth records-If your ancestor had a child around 1940, their address will be on that child's birth certificate.
  • Death records-If a close relative of your ancestor died around 1940, they may have been the informant for mortuary records and death certificates.
  • Voter registration rolls-If your ancestors voted, you may be able to locate them in voter registration rolls.
  • Newspapers-If your ancestors got their name in the newspaper (child was married, spouse died, property was purchased, etc.) you may be able to find them listed in a newspaper with their address.
  • Military records-If your ancestor was in the military around 1940, their address will be on their military records, draft registration cards, and so forth.

Those are only a couple of ideas of where to look to find where the address where your ancestors lived. There are many other options such as club memberships, employment records, church records, etc., where their address may be recorded.

Image courtesy of the NARA website (public domain)
Image courtesy of the NARA website (public domain) | Source

Did you know...?

One of the problems with the census is that we have no idea who the enumerator talked to. There was no requirement that they talk to the head of household. In fact, they didn't even have to talk to a household member. The landlord, employer, neighbor, and others could provide answers for any household.

The 1940 U.S. Federal Census enumerator left us a clue as to who they spoke to. If they interviewed someone who is listed in the family group, there is a x with a circle around it by their name. Pretty nifty, eh?

Information Collected in the 1940 Census

  • Location: Street, avenue, road, etc. House number (in cities or towns)
  • Household Data: Number of household in order of visitation; Home owned (O) or rented (R); Value of home, if owned, or monthly rental, if rented; Does this household live on a farm? (Yes or No).
  • Name of each person whose usual place of residence on April 1, 1940, was in this household.
  • Relationship of this person to the head of the household, as wife, daughter, father, mother-in-law, grandson, lodger, lodger's wife, servant, hired hand, etc.
  • Personal Description: Sex - Male (M), Female (F), Color or race, Age at last birthday,Marital status - Single (S), Married (M), Widowed (Wd), Divorced (D)
  • Education: Attended school or college any time since March 1, 1940; Highest grade of school completed
  • Place of Birth: If born in the United States, give State, Territory, or possession. If foreign born, give country in which birthplace was situated on January 1, 1937. Distinguish Canada-French from Canada-English and Irish Free State (Eire) from Northern Ireland
  • Citizenship of the foreign born;
  • Residence, April 1, 1935: In what place did this person live on April 1, 1935?
  • Employment Status: Was this person AT WORK for pay or profit in private or nonemergency Gov't. work during week of March 24-30? (Yes or No) If not, was he at work on, or assigned to, public EMERGENCY WORK (WPA, NYA, CCC, etc.) during week of March 24-30? (Yes or No).
  • If neither at work nor assigned to public emergency work. ("No" in Cols. 21 and 22) Was this person SEEKING WORK? (Yes or No) If not seeking work, did he HAVE A JOB, business, etc.? (Yes or No) Indicate whether engaged in home house-work (H), in school (S), unable to work (U), or other (Ot), Number of hours worked during week of March 24-30, 1940. If seeking work or assigned to public emergency work. ("Yes" in Col. 22 or 23), Duration of unemployment up to March 30, 1940 - in weeks.
  • Occupation, Industry and Class of Worker: For a person at work, assigned to public emergency work, or with a job ("Yes" in Col. 21, 22, or 24), enter present occupation, industry, and class of worker. For a person seeking work ("Yes" in Col. 23): a) If he has previous work experience, enter last occupation, industry, and class of worker; or, b) If he does not have previous work experience, enter "New worker" in Col. 28, and leave Cols. 29 and 30 blank
  • -Occupation: Trade, profession, or particular kind of work, as frame spinner, salesman, rivet heater ,music teacher
  • -Industry: Industry or business, as cotton mill, retail grocery, farm, shipyard, public school
  • -Class of worker
  • -Number of weeks worked in 1939 (Equivalent full-time weeks).
  • Income in 1939 (12 months ended December 31, 1939): Amount of money wages or salary received (including commissions), Did this person receive income of $50 or more from sources other than money wages or salary (Yes or No),
  • Number of farm schedule (if dwelling is a farm)


There were several other supplemental questions asked as part of the 1940 Census. However, those questions were only asked to about 5% of the population so I won't cover them here. If you would like to learn more about the supplement questions, visit the NARA's 1940 Census, General Information.

Understanding the Census

Why did the government take censuses? What information might one find in any given census? Those answers and more can be found in this guide.

This detailed research guide for researching the census. It includes various techniques for finding your relatives. It provides information of each census, what information was included, and how to interpret it.

This is a handy guide to understanding what the census is about and why it is so important to genealogists.

I Learned About Their Lives From the 1940 Census

I filled in blanks in my tree, but much of what I hoped to learn was the stories surrounding my relatives. The Depression took its toll on many families. From the 1940 Census, I saw how many families held on to their homes and how many didn't. Some who left Alameda County, California at the beginning of the Depression, returned by 1940 as manufacturing jobs were easier to come by.

I found a few relatives employed in government programs, most notably the WPA. In one case, it was the female head of household holding the WPA job because the male head of household was incapacitated. From this, I could see FDR's New Deal at work. I also found that the woman in my tree persisted in bucking the conventional wisdom that women didn't work. As with the 1920 and 1930 census, married women and single women were holding down jobs.

Finally, I learned quite a bit about education. My people were mostly lower to middle class folks. There were only a handful of high school graduates and only one college attendee within a few hundred relatives. Most made it through 4-6 years of schooling. For the older generation an education wasn't seen as important. For the younger generation, their parents needed them to work for survival.

This was an informative census. I not only learned the usually genealogical data, I learned the factors that might have affected my relatives.

Go Forth and Research!

Now you're ready to research your own family. Let me know in the census how your research is going and if you found anything interesting about your family. If you have any questions, I'll do my best to answer them in the comments. Thanks for visiting!

Time to get ready for the census!

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    • MelRootsNWrites profile imageAUTHOR

      Melody Lassalle 

      5 years ago from California

      Thanks so much for your comments and the up vote, Kristen!

    • Kristen Howe profile image

      Kristen Howe 

      5 years ago from Northeast Ohio

      This hub was useful and very informative on how to do research for genealogy. Voted up!

    • MelRootsNWrites profile imageAUTHOR

      Melody Lassalle 

      6 years ago from California

      Thanks Virginia! The 1940 census is so important for genealogists. It's the first time many of us will see our parents in the records--and people who are still living. I didn't think I would learn much from this one because of how long I've been researching, but it's been an informative census.

    • Virginia Allain profile image

      Virginia Allain 

      6 years ago from Central Florida

      Very detailed, very helpful. Anyone interested in their family history will get a boost with this info.

    • profile image


      7 years ago

      2012 was such a hectic year for me. I haven't had time to get into the 1940 census. I know it will be very informative for me. Looking forward to it. Great lens on it.

    • nyclittleitaly profile image


      8 years ago

      A lot of good info here. Thanks

    • profile image


      8 years ago

      I am just starting in tracing family history and I am soooooo excited! Hopefully they have all the glitches figured out!

    • profile image


      8 years ago

      This is great. I'm going to have to check out your other lenses about genealogy. I've always wanted to start mine but haven't yet been able. to. Thanks for sharing this. :)

    • SusannaDuffy profile image

      Susanna Duffy 

      8 years ago from Melbourne Australia

      You always have the best information on genealogy - now it's how to prepare research in the 1940 US census

    • flycatcherrr profile image


      8 years ago

      Excellent news! There are a few 20th-century gaps in the USA half of my family tree.

    • profile image


      8 years ago

      Thanks for the information! I thought I knew everything about my family, but realize that the census would indeed fill in some spots-- thanks!

    • MariaMontgomery profile image


      9 years ago from Central Florida, USA

      Thank you for a truly informational lens. I've been wanting to begin this research, but haven't done it yet. My dad died 2 years ago, and in some of his papers was a strange-looking census form from 1930. It listed only one child - him. His middle name was Coyle, but the census worker who typed the form spelled it as "Coil". I wonder how many more mistakes are out there.

    • profile image


      9 years ago

      ugh, for your insightful information, earned a 'thumbs up'.

    • MelRootsNWrites profile imageAUTHOR

      Melody Lassalle 

      9 years ago from California

      @TeacherRenee: I'm glad you found the lens informative. I can't wait for the census to be released. I have so many holes on my Grandma's side to fill in. I wish she were still alive as some things I need to resolve are from stories she and her sister told me.

    • MelRootsNWrites profile imageAUTHOR

      Melody Lassalle 

      9 years ago from California

      @ChrissLJ: Chriss, this is very true! And, I think, will most likely have a free copy on their website. It's great to see how genealogy has changed. We are no longer limited by whether we can get to the National Archives or a Family History Center.

    • profile image


      9 years ago

      I had no idea the census was being released so soon. This is a very informative lens, thank you.

    • ChrissLJ profile image


      9 years ago

      The good news is though even if you miss the one year cut off of free access for the census, you can access it via Heritage Quest or But what most people don't realize is they don't need a private (COSTLY!) account. Most library systems offer free access to their library card holders and usually have one that you can access from home in your pajamas via their virtual branch (library website).


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