Best website for market research (SFR) - crime stats, etc.?

[Frank Perkins]

Forgive me in advance as I'd imagine this question has been asked and answered before, couldn't find it myself.

What is the best website for researching cities, neighborhoods, average income, crime stats, average rents, etc.  I know there are niche sites that cover some of these, but is there one master site that does the most?  I'm fine with signing up.  Thanks in advance.