Montrose is a hamlet within the town of Cortlandt, in the northwestern corner of Westchester County, New York, United States. It is located near Croton-on-Hudson and Buchanan. The rural character of the hamlet is defined by the Hudson River, numerous wooded hills and steep slopes, wetland areas and beautiful streams. As of the 2010 census, Montros…Montrose is a hamlet within the town of Cortlandt, in the northwestern corner of Westchester County, New York, United States. It is located near Croton-on-Hudson and Buchanan. The rural character of the hamlet is defined by the Hudson River, numerous wooded hills and steep slopes, wetland areas and beautiful streams. As of the 2010 census, Montrose had a population of 2,731.