Violent crime is composed of four offenses: murder and nonnegligent manslaughter, rape, robbery, and aggravated assault. Violent crimes are defined as those offenses that involve force or threat of force.
The rate of crime is the total number of crimes reported to police agencies within a county per 100,000 residents in 2014. The population figures are sourced from the 2014 American Community Survey 5-year estimates.
Law enforcement participation in the Uniform Crime Report is voluntary.
The data presented in Crime in the United States reflect the Hierarchy Rule, which requires that only the most serious offense in a multiple-offense criminal incident be counted.
The Federal Bureau of Investigation's Uniform Crime Report is the most comprehensive source of crime data in the United States. The FBI cautions against using the data in this report to compile rankings. The data published here are meant solely to illustrate the relative rates of crime, and not to make assertions about the effectiveness of law enforcement.
There are many factors that affect the rate and nature of crime, such as the degree of urbanization, composition of age groups, economic climate, and modes of transportation within an area, which are not considered here.