Armonk is a hamlet and census-designated place in the town of North Castle, located in Westchester County, New York, United States. The corporate headquarters of IBM are located in Armonk. As of the 2010 census, Armonk's CDP population was 4,330 and it has a total area of 6.1 square miles, of which 6.0 square miles is land and 0.077 square mil…Armonk is a hamlet and census-designated place in the town of North Castle, located in Westchester County, New York, United States. The corporate headquarters of IBM are located in Armonk. As of the 2010 census, Armonk's CDP population was 4,330 and it has a total area of 6.1 square miles, of which 6.0 square miles is land and 0.077 square miles, or 1.54 percent, is water.
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