How to find the vacancy rate in a city?

[Diane O.]

Hi - newbie here :-).  I just finished reading the Intro to Real Estate Investment Deal Analysis post.  So now I am playing around with current properties in my area to get comfortable with running the numbers.  But one piece of info needed is the average vacancy rate.  A quick google search didn't help.  Does anyone have a website they use to find this info?  Any other thoughts are welcome! Thanks in advance!