The FBI's annual Uniform Crime Report includes information submitted by local law enforcement agencies. The information is compiled and released to the public in the fall of the year that follows the reported year.
In 2011, Mansfield had 47 violent crimes, two cases of murder of non-negligent manslaughter, nine counts of forcible rape, three robberies, 33 cases of aggrivated assualt, 395 cases of property crime, 149 cases of burglary, 224 counts of larceny, 22 counts of vehicle theft and one arson.
Violent crimes include murder and non-negligent manslaughter (willful, non-negligent killing of one human being by another, according to the FBI's website), forcible rape (including attempts and "assaults to commit rape"), robbery and aggravated assault. The Uniform Crime Report also features property crimes, which include burglary, larceny-theft, motor vehicle theft and arson.
All instances of crime, with the exception of murder/non-negligent manslaughter, motor vehicle theft and burglary are down since 2010.
A list of the reported crimes in each Massachusetts city and town in 2011 can be found here. The 2010 statistics can be found here. The FBI advises against comparing cities and towns to create rankings. The reasoning is explained here.
Nationwide, the number of reported violent crimes is down for the fifth-straight year. The number of reported property crimes is down for the ninth year in a row. Go here for more information on the nationwide statistics.