Valhalla is a hamlet located in the town of Mount Pleasant in Westchester County, New York, United States. It is situated about 25 miles north of New York City, and has a population of around 4,000 people. Valhalla is known for its many healthcare facilities, including the Westchester Medical Center and the Maria Fareri Children’s Hospital, which are both located within the hamlet. The hamlet is also home to the Kensico Dam, which is a large stone dam that forms the Kensico Reservoir, a major source of drinking water for New York City. Valhalla is primarily a residential community, with a mix of single-family homes, townhouses, and apartment complexes. Valhalla is situated near several major highways and is served by the Metro-North Railroad, providing easy access to New York City and other nearby destinations.