I have done a similar thing, but by posting thousands of addresses by hand. There are some considerations to share:
If you have a lot of areas to divide into you may consider to use forums for each area. This will lead to a large number of forums. vbulletin can only have a limited number of forums. Above a certain number performance will go down rapidly.
vb CMS is coming out. It will allow widgets to be created. An index widget may suit you. It may be worth waiting for that.
Do you want your members to rate the dentists?
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