If you are creating (or have now) a localized website, it's recommended that you mention your geographical information on your pages. That may seem overly simple (a "Duh!" statement), but many webmasters will not target their specific ZIP codes and such. Google Webmaster Tools has an option to associate your site to a geographical location, and that's one great point to stress if your audience is localized. Todays SE's robot crawlers are looking for area codes, zip codes, and even cities so they can bring more relevant searches returned to their users. So think about that when tweaking your localized sites.