Where is the oldest operating post office in the United States of America?

"... The clapboard post office in Hinsdale, N.H., celebrated its 200 th birthday in 2016. It’s the oldest continuously operating post office in the United States. Nathan Babbitt appointed himself Hinsdale’s first postmaster in 1815 and had the building constructed the next year. ..."   
Source: www.newenglandhistoricalsociety.com

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