River Vale is a township in Bergen County, New Jersey, United States. 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. The township was ranked #29 on the 100 Best Places to Live 2007 survey published by CNN/Money magazine.
River Vale was formed as a township on April 30, 1906, from portions of Hillsdale Township (now the Hillsdale Borough) and Washington Township.
On January 5, 1904, the temperature in River Vale fell to −34 °F (−37 °C), the lowest temperature ever recorded in New Jersey.