In Laughlin, I remember stopping into a good sized bar on the south end of town, on a hill and not far from Harrah's. Of course I can't remember the name of it but it had 4 bar tables that seemed to play fairly well. Another option is to cross the river to Bullhead City where you can find a variety of bars with barboxes.
In Kingman, bars are the only game in town - no pool halls that I know of. There was a popular sports bar off the main drag that the players would congregate at. I don't remember the name but if someone mentions it, I'll recognize it. They had 4 barboxes also.