Uniform Crime Statistics (National) – http://www.fbi.gov/stats-services/crimestats
Representative questions that can be answered with this resource:
- Where can I find tables of murder by relationship?
- How many arson cases were there in Pittsburgh in 2012?
- How has the number of aggravated assaults in Alaska varied from 1960 through 2012?
- How many police officers did Los Angeles have in 1990?
From the website:
Crime in the U.S. is the most comprehensive analysis of violent crime and property crime in the nation. The annual publication compiles volume and rate of crime offenses for the nation, the states, and many cities and counties. It also includes arrest, clearance, and law enforcement employee data.
This set of reports can be helpful in establishing the level of crime in the local of your story.