This guide links to a multitude of governmental agencies that are responsible for producing statistics.
A great resource that provides access to a multitude of U.S. statistics is the Statistical Abstract of the United States, which is a compendium of statistics from a variety of government agencies. The most current edition is available in the Reference section of the IUS Library. Older editions are available online (1878-2011) and in Reference (1950-present)
Call number: REF HA202.A3
Demographic yearbook of the U.N.
Call number: REF HA17.D45
This is a good source for statistics about other countries.
This is an online clearing house for US government statistics. The a-z index gives links to statistics about various topics.