You are encouraged to use the two comprehensive library research guides seen below. Particularly if you don't have a familiarity with the scope of a national census and awareness that there are different types of censuses.
If you simply want to get started using resources click on the link Finding Census Information
Some tools for the US Census:
The Current Population Survey (CPS), sponsored jointly by the U.S. Census Bureau and the U.S. Bureau of Labor Statistics (BLS), is the primary source of labor force statistics for the population of the United States.
Agency Publications & Landing Pages