You can easily find official statistics by adding .gov to your search. Let's say I wanted to investigate crimes in Las Vegas:
Keyword Search: crime statistics and Las Vegas site:.gov
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Index to the literature of public policy, social policy, and the social sciences in general.
An easy way to find government information (federal, state, and local) is to go to Google and limit your search to only government sources.
For example, let's say you want to focus on global warming--Type in "global warming" site:.gov to limit only to government resources.
You can also specify finding statistics on Google and limiting it to .gov sources.
For example, if you want to find out about recycling statistics, type in "recycling statistics" site:.gov