Hello Dr. Tennis,
I can't presume to answer for anyone else, or even actually to represent the institution for which I work, but you can get a good start on your count by looking at the Library of Congress Classification number "Z695" (if you can get your hands on the actual schedule, you will see quite a bit spelled out in its pages) and page through from there.
To see more of the actual titles at these classification numbers, you'll want to do a shelflist search (call number browse) beginning at the top of of Z695...
From: Discussion List for issues related to cataloging & metadata education & training [mailto:[log in to unmask]] On Behalf Of Joseph Tennis
Sent: Wednesday, February 20, 2013 5:34 PM
To: [log in to unmask]
Subject: [eduCAT] How many controlled vocabularies?
Friends and colleagues,
I am wondering if anyone knows how many controlled vocabularies exist in the world today? I am aware of the OBO Foundry, Taxobank, and I have started to collect lists from other places, but I don't have a clue as to whether these are a representative sample or not. I can only start to understand if I know how many are out there (in every different version). Does anyone have an idea? Does anyone know where I might look? Does the SAS collection at Toronto serve as a complete inventory of these things?
And by controlled vocabulary I mean classification schemes, thesauri, terminologies, ontologies, etc. Anything that is a restricted set of semantics used in the process of indexing or labeling. Yes, that is very general ;-)
Thanks for any and all help you can provide.
Joseph T. Tennis
The Information School
University of Washington
Reviews Editor for the journal Knowledge Organization
[log in to unmask]<mailto:[log in to unmask]>