The Department of Justice maintains a statistics page worth looking at. The page has statistical reports on crime, prosecution, corrections, law enforcement, sentencing, criminal records, and others. Many of the pages include graphs and annual reports. A topic’s initial page offers key data with links to more detailed reports. Each topic also includes a listing of relevant publications summarizing data collected.
The main page includes a link to the “Sourcebook of Criminal Justice Statistics” which is housed on the University at Albany’s website. The cool thing is that older editions are archived on the site, going back to 1994.
Remember, it is important to pay attention to both when the page and data was last updated.