It depends on what kind of statistics you need. Do you need government statistics? If so, here is a great start:
http://libguides.roanoke.edu/statistics
If the statistics you need are on a specific topic, and you think the United States government might have the numbers you need, then Google the topic you need (example: drunk driving in Virginia) and site:.gov. This will give you results from ONLY government sites that may have drunk driving statistics in Virginia.
For more information, please see your friendly reference librarian.