I recently moved to Paradise from Fairfax.
The best source for determining the crime rate is to contact the local police department, which I did.
The result was ridiculously low rate of crime for this area (Paradise subdivision). For example, most of the reports involved traffic stops. Violent crime is almost non-existent and involves family disputes. Moreover, property crime is relatively and surprisingly light.
There are a few offenders on the Virginia registry of sexual offenders, however they do not impact the crime statistics.
An interesting comparison is between Prince William County and Loudoun County crime report map:
Perception is that Loudoun is safer, yet the frequency of offenses from this objective source do not support that perception.