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Find more Kosak 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 76 less people named Kosak 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 425 people named Kosak in the 1930 U.S. Census. In 1940, there were 18% less people named Kosak in the United States. What was life like for them?

Picture the past for your ancestors.

In 1940, 349 people named Kosak were living in the United States. In a snapshot:

  • Although 50% were female, the most common name for males was Frank
  • 330 rented out rooms to boarders
  • 5% were disabled
  • They typically took 10 weeks of vacation a year

Learn where they came from and where they went.

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

  • 51% were first-generation Americans
  • Most immigrants originated from Poland
  • The most common mother tongue was Polish
  • Most mothers originated from Poland