Armonk is a hamlet and census-designated place located in the town of North Castle in Westchester County, New York. As of the 2010 census, the CDP population was 4,330. Armonk is home to the global headquarters of information technology company IBM and bond insurer MBIA, and the Americas headquarters of reinsurer Swiss Re. The Smith Tavern, a historical site and landmark of the Revolutionary War, is located in Armonk and is the home of the North Castle Historical Society. The North Castle Public Library, a member of the Westchester Library System, is also located in Armonk. Whippoorwill... Country Club is located in Armonk and is one of Westchester's best courses. Armonk is located at 41°7′43″N 73°42′28″W / 41.12861°N 73.70778°W / 41.12861; -73.70778 . According to the United States Census Bureau, the CDP has a total area of 6.1 square miles , of which 6.1 square miles is land and 0.04 square miles is water. As of the census of 2000, there are 3,461 people, 1,172 households, and 995 families residing in the CDP. The population density is 568.9 per square mile .
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| County: | Westchester County |
| State: | New York |
| Population: | 3,461 |
| Area: | 6.1 sq. mi. |
| Time zone: | North American Eastern Time Zone |
| Also known as: | Armonk, New York, Westchester County / Armonk CDP |