The written and verbal testimonies certify the production of farina bòna in Vergeletto.
The municipalities of Gresso, Mosogno, Vergeletto, Onsernone and Isorno are considering a merger some time in the future into a new municipality which will be known as Onsernone.
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The municipality was formed in 1882 by splitting from Vergeletto.
Santa Maria Maggiore borders the following municipalities: Campo (Vallemaggia) (Switzerland), Craveggia, Druogno, Malesco, Masera, Montecrestese, Toceno, Trontano, Vergeletto (Switzerland).