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Find more Hennessey 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 689 less people named Hennessey 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 5,046 people named Hennessey in the 1930 U.S. Census. In 1940, there were 14% less people named Hennessey in the United States. What was life like for them?

Picture the past for your ancestors.

In 1940, 4,357 people named Hennessey were living in the United States. In a snapshot:

  • 195 were disabled
  • 1% reported their race as other than white
  • 35% of adults were unmarried
  • 42% owned their homes, valued on average at $3,921

Learn where they came from and where they went.

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

  • The most common mother tongue was Jula
  • 1,939 were first-generation Americans
  • Most fathers originated from Ireland
  • 11% were born in foreign countries