Hornsby is derived from a convict turned constable Samuel Henry Horne who took part in capturing Bushrangers in June 1830. In return he was granted land which he named "Hornsby Place."
The first Post office opened in 1864
The railway came through in September 1886.
Hornsby Shire Council was established in 1906.
In 1961 The Westfield Group built a shopping Mall at Hornsby.
Hornsby is 25 km from the Sydney CBD.
The Population at the 2016 Census was 22,168.