Hi,
London -> Londoner
Paris -> Parisian
Vienna -> ???
(If you could give me a link to a longer list with such info, it would be greatly appreciated)
You would call that person a Viennese . org/wiki/List_of_adjectivals_and_demonyms_for_cities Take a look at the "See Also" list at the bottom of that link.
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You would call that person a Viennese.
https://www.lexico.com/en/definition/viennese