Add Yahoo as a preferred source to see more of our stories on Google. The census is conducted every 10 years in the United States, but did you know it’s required by the Constitution? In Article I, ...

Here's some background information about the census, a count of US residents that takes place every ten years. The Census Bureau is part of the Department of Commerce. Other Facts: The census is ...

2.5 million: In July 1776, the estimated number of people living in the newly independent nation. 321.2 million: The nation’s estimated population on this July Fourth.