I spent some time out in that area and never met another AZ'er. But pool is fairly active in those small towns - mostly bar league players from what I could tell. There is a pool room with full sized tables in Havasu (Mike's, I think). Last vist I made to Havasu, I hung out at KcKees. Laughlin has a bar with 4 well kept tables near Harrah's. Kingman has a pool hangout just off one of the main streets which also has 4 bar tables. Of course, I can't remember the name.
Don't expect big action in any of these places. Friendly action can be found though.