What does un mean in the column for immigration year on the 1920 United States census? Other people have a year entered.

  • "un" could be "unknown". Can you give an example, so we can look at it? Jan 5, 2020 at 22:09

1 Answer 1


The "Instructions to Enumerators" for the 1920 census include the following instruction in the second paragraph, titled Definite answers:

Definite answers - Try to get a definite answer to each inquiry according to the instructions herein given. But if after every effort you can not obtain the desired information write "Un" (for unknown).

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