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Find more Hallahan 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 3 less people named Hallahan 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 899 people named Hallahan in the 1930 U.S. Census. In 1940, there were 0% more people named Hallahan in the United States. What was life like for them?

Picture the past for your ancestors.

In 1940, 896 people named Hallahan were living in the United States. In a snapshot:

  • On average men worked 41 hours a week
  • 238 adults were unmarried
  • 2 reported their race as other than white
  • 225 were children

Learn where they came from and where they went.

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

  • Most immigrants originated from Ireland
  • Most mothers originated from New York
  • 420 were first-generation Americans
  • They most commonly lived in Pennsylvania