John Kremer is a book marketing consultant and author of 1001 Ways to Market Your Books. He caters to the small indie press and self-publishing crowd. But still, I get his newsletter every week and there are often tips I find useful.
So I was happy, as I was trolling for more publishing associations to mention here, to find his list of nearly 100 of them. He freely admits that some may be out of date (for instance, I can't find much online evidence of the Indianapolis Publishers Association that he mentions). But there are still plenty of good leads here for ferreting out smaller publishers and contact names.