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Find more Riordan 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 787 less people named Riordan 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 4,058 people named Riordan in the 1930 U.S. Census. In 1940, there were 19% less people named Riordan in the United States. What was life like for them?

Picture the past for your ancestors.

In 1940, 3,271 people named Riordan were living in the United States. In a snapshot:

  • The average annual income was $1,330
  • 4 reported their race as other than white
  • 3,144 rented out rooms to boarders
  • Although 52% were female, the most common name for males was John

Learn where they came from and where they went.

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

  • 17% were born in foreign countries
  • 1,683 were first-generation Americans
  • 408 migrated within the United States from 1935 to 1940
  • 41% were first-generation Americans