Actually, you can, sort of. As long as the members put their locations in their profile or in a post, you can do a member search and see if you get any matches.
Just for giggles I put Alabama in the member search and got 152 matches. of course, they are mostly from Black Rob.
I also tried Los Angeles and got 82.
Click the members link at the top of the page, then input your location in the top box in the search window and hit search. You may have to try to input the location in more than one way: Los Angeles or California or CA etc in order to find everyone who may have more or less generalized their locations.
Hope this helps.