Luckily for you (and me!) Lee Oden over at Online Marketing Blog has done a lot of the research for us and collected a quite comprehensive list of Regional Search Marketing Associations! I hope you find one in your backyard!
In the interest of developing a good list of search and interactive marketing organizations, I am posting this list of interactive and search marketing organizations as well as a few organized meetups. If you are aware of others, please leave a note and URL in the comments. I’ll review and add them to the list.