I maintain the laws page. The site is incomplete because it's based on reader submissions. If you know the by-laws in your area -- and I mean <em>know</em> them -- send them in and I'll list them.
A list of places where it's legal to keep venomous would not be helpful. Municipalities that don't have laws banning venomous snakes aren't saying that they're legal, they just haven't run into the problem yet. If a town found out it was on a list of legal-to-keep-hots places, it would ban them pretty fast, I guarantee you.