Sounds like a great idea...
If everyone used the postal codes, it would be fairly easy to just go to the bottom of the forum page and select sort by "Thread Title." Then all the posts would be in alphabetical order.
But so many gals like to start the thread title with *****, or with "2nd Annual". Those extra characteras or numbers throw of the entire alphabetized by state idea.
If the moderators wanted to, I suppose they could act as Chief Editors and just change everyone's title when they "don't do it correctly."