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Find more Neilsen 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 258 less people named Neilsen 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 2,466 people named Neilsen in the 1930 U.S. Census. In 1940, there were 10% less people named Neilsen in the United States. What was life like for them?

Picture the past for your ancestors.

In 1940, 2,208 people named Neilsen were living in the United States. In a snapshot:

  • 18% of women had paying jobs
  • 2,114 rented out rooms to boarders
  • The youngest was less than a year and the oldest was 91
  • 30% were children

Learn where they came from and where they went.

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

  • 327 migrated within the United States from 1935 to 1940
  • Most immigrants originated from Denmark
  • 1,060 were first-generation Americans
  • Most mothers originated from Denmark