The FBI states that the UCR Program “has been the starting place for law enforcement executives, students of criminal justice, researchers, members of the media, and the public at large seeking information on crime in the nation. The program was conceived in 1929 by the International Association of Chiefs of Police to meet the need for reliable uniform crime statistics for the nation. In 1930, the FBI was tasked with collecting, publishing, and archiving those statistics.” The site includes links to the FBI’s Crime in the United States annual reports (1995–2016 are currently available).
Part of the FBI's UCR Program, the Law Enforcement Officers Killed and Assaulted database currently includes data from 2006-2015. It is searchable by cause of death (including accidents) or type of assault and includes data such as the age and race of the victim officers, circumstances of the event, and maps of the locations.
A project of the University of Michigan‘s Institute for Social Research, the NACJD’s mission is “to facilitate research in criminal justice and criminology, through the preservation, enhancement, and sharing of computerized data resources; through the production of original research based on archived data; and through specialized training workshops in quantitative analysis of crime and justice data.” Its database allows natural language and Boolean searches of criminal justice data.
The National Criminal Justice Reference Service Document Database contains summaries of publications on criminal justice, including Federal, state, and local government reports, books, research reports, journal articles, and unpublished research from the early 1970s to present.
Searchable by keyword and browseable by geography, the Sunlight Foundation’s Hall of Justice is a database of publicly available criminal justice datasets and research from across the country, both federal and state.
“Using Commission data, the Office of Research and Data publishes periodic reports on federal sentencing practices and tracks the application of the sentencing guidelines. These data reports provide information concerning the types of crimes committed, the offenders who commit those crimes, the punishments imposed, and the manner in which the sentencing guidelines were applied.”
Since 2015, the Washington Post has maintained this page documenting fatal police shootings across the country. The data can be visualized using various refinements, including state, gender, race, and age. Includes the names and ages of the deceased. The raw data is available to download as a CSV file.