Armonk is a hamlet and census-designated place (CDP) in the town of North Castle, New York. It is located in Westchester County.[1] As of the 2020 census, Armonk's CDP population is 4,495 and it has a total area of 6.0 square miles (15.6 km2).[2][3] Armonk is well known as being the headquarters of IBM.
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