These statistic resource lists are by no means exhaustive! You will notice that most of these sites are .gov, .edu, and .org sites. You can limit your Google searches to any of these domains like this: your search terms site:.gov
Major Resources for U.S. Criminal Justice Statistics and Data
Searchable datasets and publications gathered by the National Archive of Criminal Justice data. Users may access summaries of reports and download the datasets. Provides links for additional information and research on certain topics. Year range varies.
Reports and discussions of research related to criminal justice. Topics include corrections, courts, crimes and prevention, drugs, forensic science, law enforcement, standards, and technology and tools, tribal crime, and victims and victimization.