Just a note about getting links from joining the local chamber of commerce: I have seen some cases where the local CofC uses canned software that only displays member listings and links as query responses. Those links don't persist as permanent, static pages that bots can index. If you're advising a client to join their local CofC for the sake of a solid local link, be certain that their local CofC really does create persistent indexable links. Just sayin', as my grandkids say.
Great point. Also, check to make sure they are using schema.org markup for their listings. Also, if the directory is "private" and only searchable (e.g. no generic listing page) then the search engines can't really identify it as a directory which likely lowers it's "authority" in terms of individual directory listings.
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