The best source of information will be the local police department that patrols that particular zip code for town specific crime questions. If there is a specific area or neighborhood that interest you go ask the neighbors, what they think of that neighborhood? Check out this site http://www.factfinder.census.gov
If you would like to take a little tour of 85020, I'd be happy to drive you around the neighborhood... since my office in in 85020, I do know the area very well.
Hope this has been helpful... Gene
Please feel free to contact me so we can talk about this in more length.
Hope that helps.
Real Estate Professional
Keller Williams Sonoran Living
Licensed Associate Broker
Accredited Buyer Representative
GREEN Designated Agent
William Raveis Legends Realty Group
Since safe may mean something different to different people we here in Arizona have a living document called the Buyer Advisory (http://www.aaronline.com/documents/buy_advis.pdf). It has links to assist you in gathering information about communities including factors that will help you make informed decisions about safety.