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1940 Census data: what you need to know to look up relatives

Monday's release of 1940 Census data sets off frenzy to dig into records on family past, crashing the website. When it comes back online, you'll need to know a few basics.


This screen grab taken on April 2, shows the page for the 1940 Census on the National Archives website. Interest in the newly released 1940 US census is so great that the government website with the information nearly crashed on Monday, shortly after the records became available to the public for the first time.

National Archives and Records Administration via World Wide Web/AP

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Do you want to know more about your parents or your grandparents? How much money they made, or maybe what they were doing in 1939, when the nation was still trying to recover from the Great Depression?

As it turns out, you would not be alone: On Monday, the US Census Bureau released a trove of personal information it had gleaned from its 1940 Census. For 72 years, the information was considered private. Today, anyone with a computer or a laptop can find out whether their great aunt really did live in a house with a flush toilet or great-grandpa Billy really was a doughboy in World War I.

But, don’t try to find out the information on Monday.

The US Census website is so busy that most computer searches are timing out or not returning results.

According to, 1940 Census was the most searched term on Monday with some 22.5 million hits in three hours. Even when the US Census officials tried to show off the site to reporters in the morning, they had difficulty getting through. One official from joked that he hoped people would use the site but “not all in the next 30 minutes.” He should have said the next 24 hours.

Many of those jumping onto the site were concerned with genealogy.

“I think genealogists have been waiting and drooling over these records being released,” says Stacy Gimbel Vidal, a spokeswoman for the US Census Bureau.

The Census estimates there are still some 21 million people who answered the Census in 1940 who are still alive today.


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