River Vale is a township in Bergen County, New Jersey, United States. River Vale is the most eastern town in an area of the county referred to as the Pascack Valley. As of the 2010 United States Census, the township's population was 9,659, reflecting an increase of 210 (+2.2%) from the 9,449 counted in the 2000 Census, which had in turn increased by 39 (+0.4%) from the 9,410 counted in the 1990 Census.