2013-present. The Statistical Abstract of the U.S. includes brief statistics on almost every topic. The focus is on the U.S. but some international statistics are included. This is a great source to start with to find which agency or organization has collected more in-depth statistics.
1790-present. The tool provides easy mapping and report creation functions for U.S. Census data on population and housing, as well as statistics on religion, crime and health; and statistics from Canada, the United Kingdom, and Europe..more.
As of July 2019, Data.Census.gov is the official source for U.S. Census data. It offers a single search box interface for finding Census and ACS data. All new data will be released here. American Factfinder will be retired in June 2020.
The source for statistics gathered and made available by the United States government. Statistics include population and social & cultural demographics by all U.S. Census subdivisions such as United States, Metropolitan Statistical Areas, States, Counties, Places, Tracts, and Block Groups. Also includes Zip Codes, County Business Patterns, and more.
From the U.S. Department of Justice this site includes statistics for corrections, courts, crime types, law enforcement, victims, the Federal Justice System, and more by topic. Uniform Crime Reports (UCR) table building tool is available here.
From the Center for Disease Control & Prevention, the National Center for Health Statistics is a rich source of information about American health. Health statistics include FastStats, health survey results, health status of the population, experiences with the health care system, identification of health problems, impact of health policies and programs, and more....more.
Located at the University at Albany, School of Criminal Justice since 1973, this resource "brings together data from more than 100 published and unpublished sources about many aspects of criminal justice in the United States." Data included come from State and Federal agency reports, research centers, universities, private companies, and other organizations. The data selected meet two standards: (1) data must be national in scope or of nationwide importance and if possible, the data are displayed by regions, States, and cities; and (2) "data must be methodologically sound with respect to sampling procedures, data collection methods, estimation procedures, and reliability of the information." (text from site 10/22/2013)