By parallelism, I mean you need some way to relate the state ids in the profile field drop-down to the forum id of that specific state. Some quick thoughts that come to mind:

1.) Make them equal. (IE: Alabama would have an id of 1 of the drop-down and forum id 1 will also be the Alabama forum.) This, however, could get pretty messy.

2.) A separate table, so you can link between the two.

| stateid | forumid |

You can query the table with the state id, and pull the forum id and use it...