Cliffside Park is a borough located in Bergen County within the state of New Jersey in the United States. It serves as a residential community situated in the northeastern region of the country.
According to the 2020 United States census, the borough had a population of 25,693. This figure represents an increase of 8.9% from the 2010 census count of 23,594, which followed a growth of 2.6% from the 23,007 residents recorded in the 2000 census.