This area was originally part of
Narrabeen but was renamed after the
SS Collaroy ran aground on the beach in 1881. It was refloated and later wrecked on the
Californian coast in 1889. Most of Collaroy's development has occurred since the mid twentieth century. An anchor from the S.S. Collaroy has been on display on the grounds of Narrabeen Lakes Public School since 1928.
Collaroy Beach Post Office opened on 12 February 1923.
Collaroy Plateau Post Office opened on 1 April 1949 and closed in 1988.
Collaroy Plateau West Post Office opened on 1 November 1967 and was renamed
Collaroy Plateau in 1996. The beach and housing near the beach on Pittwater Road were badly affected by weather in early June 2016. A strip of houses lost backyards and were left in danger of collapse. ==Landmarks==