here's a link to Canadian Assembly hall's tax returns, compare some to each other. I know Norval, Ontario( 90% sure :) ) and Onoway, Alberta ( 100% sure ) don't have any kingdom halls in them and are strictly used for assemblies. I don't know why more didn't appear as I know there is one in Calgary that has 5 kingdom halls in it which is also used as an assembly hall.
I tried it twice. The link didn't work. Is there another way you can show the content? I'm curious.