County poverty

I came across this map showing the poorest states and counties in the US.  I clicked around on the dark red counties around the nation and there were few (only in Appalachia, the Dakotas and a couple of deep south states) that rival my current home state.  I guess I am not terribly surprised, considering that apparently 1/3 of the children in my county do not have running water at home. 

And what is the poorest state in the US right now?  That was news to me: Mississippi.