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Find more Denn relatives and grow your tree by exploring billions of historical records. Taken every decade since 1790, the U.S. Federal Census can tell you a lot about your family. For example, from 1930 to 1940 there were 556 more people named Denn in the United States — and some of them are likely related to you.

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Create, build, and explore your family tree.

What if you had a window into the history of your family? With historical records, you do. From home life to career, records help bring your relatives' experiences into focus. There were 725 people named Denn in the 1930 U.S. Census. In 1940, there were 77% more people named Denn in the United States. What was life like for them?

Picture the past for your ancestors.

In 1940, 1,281 people named Denn were living in the United States. In a snapshot:

  • 80 reported their race as other than white
  • 403 were children
  • 5% were disabled
  • For 648 females, Anna was the most common name

Learn where they came from and where they went.

As Denn families continued to grow, they left more tracks on the map:

  • 15% migrated within the United States from 1935 to 1940
  • They most commonly lived in New York
  • The most common mother tongue was French
  • 22% were first-generation Americans