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Find more Koestler 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 57 more people named Koestler 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 153 people named Koestler in the 1930 U.S. Census. In 1940, there were 37% more people named Koestler in the United States. What was life like for them?

Picture the past for your ancestors.

In 1940, 210 people named Koestler were living in the United States. In a snapshot:

  • 53%, or 26 people, lived in homes they rented
  • 85 were children
  • On average men worked 45 hours a week
  • For 107 females, Esther was the most common name

Learn where they came from and where they went.

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

  • 21% were born in foreign countries
  • They most commonly lived in New Jersey
  • 25 migrated within the United States from 1935 to 1940
  • 48% were first-generation Americans