You've got family at Ancestry.

Find more Rosmussen 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 2,101 more people named Rosmussen in the United States — and some of them are likely related to you.

Start a tree and connect with your family.


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 27 people named Rosmussen in the 1930 U.S. Census. In 1940, there were 7781% more people named Rosmussen in the United States. What was life like for them?

Picture the past for your ancestors.

In 1940, 2,128 people named Rosmussen were living in the United States. In a snapshot:

  • 96% rented out rooms to boarders
  • For 1,040 females, Mary was the most common name
  • 298 owned their homes, valued on average at $3,022
  • 23% of adults were unmarried

Learn where they came from and where they went.

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

  • 307 migrated within the United States from 1935 to 1940
  • 48% were first-generation Americans
  • 10 were born in foreign countries
  • Most fathers originated from Utah