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Find more Mackay 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 475 less people named Mackay 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 5,415 people named Mackay in the 1930 U.S. Census. In 1940, there were 9% less people named Mackay in the United States. What was life like for them?

Picture the past for your ancestors.

In 1940, 4,940 people named Mackay were living in the United States. In a snapshot:

  • 4,702 rented out rooms to boarders
  • 947 adults were unmarried
  • 175 reported their race as other than white
  • 1,199 were children

Learn where they came from and where they went.

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

  • Most immigrants originated from Scotland
  • Most mothers originated from New York
  • 13% migrated within the United States from 1935 to 1940
  • They most commonly lived in New York