The standard summary of statistics on the social, political, and economic organization of the United States. Newer editions can be found in the print reference collection.
The purpose of Data.gov is to increase public access to high value, machine readable datasets generated by the Executive Branch of the Federal Government.
"The Current Population Survey (CPS) is a monthly survey of about 50,000 households conducted by the Bureau of the Census for the Bureau of Labor Statistics...The CPS is the primary source of information on the labor force characteristics of the U.S. population."
The Data Archive and Data Support arm of the Center for Population Studies at the University of Michigan, provides access to a variety of population data, geographical and longitudinal population data in the U.S., and international data.