Haverstraw is a village incorporated in 1854 in the town of Haverstraw in Rockland County, New York, United States. It is located north of Congers, southeast of West Haverstraw, east of Garnerville, nor…Haverstraw is a village incorporated in 1854 in the town of Haverstraw in Rockland County, New York, United States. It is located north of Congers, southeast of West Haverstraw, east of Garnerville, northeast of New City, and west of the Hudson River at its widest point. According to the 2019 U.S. Census estimate, the population was 12,045, an increase from the 2010 Census population of 11,910.