 Park Ridge was created as a borough by an act of the New Jersey Legislature on May 15, 1894, from portions of Washington Township, based on the results of a referendum held the previous day.The borough was formed during the "Boroughitis" phenomenon then sweeping through Bergen County, in which 26 boroughs were formed in the county in 1894 alone.Park Ridge obtained a portion of River Vale (July 15, 1929), exchanged portions with Woodcliff Lake (December 12, 1955), received part of Washington Township (November 26, 1956), exchanged portions with Hillsdale (February 10, 1958) and Woodcliff Lake (June 9, 1958) and received another part of Washington Township (August 11, 1958).