From the Findmypast blog:
The United States Census is the backbone of almost all American family trees. Have you exploited it to its fullest potential?
A census has been taken once every 10 years since 1790. Due to privacy laws, censuses are not released to the public until 72 years after it was taken. This means the most recent census available to genealogists is the 1940 US Census, and the 1950 US Census won’t be released until 2022 (on April 1st for those of you counting down the days).
The United States was actually the first nation in the world that made the census a mandatory part of its constitution. Though we’re a relatively young country, it’s comforting to know that we’ll have records of our population from the very beginning (and even earlier).
To learn more, read Search Guide: US Census at Findmypast.