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Find more Koyama 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 15 less people named Koyama 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 171 people named Koyama in the 1930 U.S. Census. In 1940, there were 9% less people named Koyama in the United States. What was life like for them?

Picture the past for your ancestors.

In 1940, 156 people named Koyama were living in the United States. In a snapshot:

  • 38% of adults were unmarried
  • For 77 females, Yuriko was the most common name
  • On average men worked 47 hours a week
  • Although 49% were female, the most common name for males was Roy

Learn where they came from and where they went.

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

  • Most fathers originated from Japan
  • 53% were first-generation Americans
  • The most common mother tongue was Japanese
  • 47% were born in foreign countries