Do a drive through. Count the number of lawns that look like they are waiting for a government program and crew to clean them up. This should give you a base number.
This begs my next question; who takes care of the yard work? I know in my neighborhood, if you have so much as a weed in your lawn, stand by your mailbox for a polite but stern letter from the HOA telling you to square your lawn away. I can't quite picture some welfare momma with her nine children pushing a lawn mower once a week. That looks too much like work.
I'm sure the lawns look like crap and the neighbors can go pound sand.