Renae is correct, you can get all sorts of valuable statistics at the City Data page. Here is a link for Riverside as a whole http://www.city-data.com/city/Riverside-California.html The best way to interpret this data is to work with a Realtor who is very familiar with the area you are interested in. They can help you understand how the community compares to other potential communities.
You can also visit my "Orangecrest" page at http://www.jasonshawnmcintyrebroker.com/orangecrest.asp. There is a "Community Reports" tab on the left hand side that you can enter ANY zip code and get a detailed report including; School Ratings, Crime Levels, Income and Education levels and much more. You can even compare two zip codes side by side.