Bureau of Justice Statistics: This US Department of Justice Web site has statistics and statistical abstracts crime, criminal offenders, victims of crime, law enforcement, and courts & sentencing.
Bureau of the Census: The Census Bureau Web site offers a huge amount of statistical data about the United States and its citizens. It includes statistics on employment, health, education, and more.
Child Trends DataBank: This resource provides information on "national trends and research on over 100 key indicators of child and youth well-being." The web site has basic and advanced search interfaces. It also provides subgroup, age, and alphabetical browse lists to help find the information you need.
Gallup Poll: The Gallup Poll Web site provides statistical results on the opinions of those polled on a wide range of social and political issues. Use the Topics A-Z list, or the quick search box to find the topics covered.
Sourcebook of Criminal Justic Statistics: "The Sourcebook of Criminal Justice Statistics brings together data from more than 100 sources about many aspects of criminal justice in the United States. These data are displayed in over 1,000 tables. The site is updated regularly as new statistics become available. The Sourcebook is supported by the U.S. Department of Justice, Bureau of Justice Statistics."