Castle Hill is a suburb of Sydney, New South
Wales, Australia located 30.1 kilometres north-
west of the Sydney GPO, in the Hills District.
Castle Hill is the administrative centre of the
local government area of the Hills Shire and
part of the suburb is located in the local
government area of Hornsby Shire.

Castle Hill's comercial area centres on a section
of the Old Northern Road at the suburb's
eastern side. Its southern side is an older, traditional shopping strip, with the modest-
sized Castle Mall shopping centre. Its northern
side is dominated by the large Castle Towers
shopping centre, with two department stores as
well as two Event cinema multiplexes (giving a
total of 16 Cinemas). A new library and community centre, with a unit apartment
building on its upper floors, opened next to
Castle Towers in 2004.

Work has finished by the local council to
convert the stretch of Old Northern Road
between Castle Mall and Castle Towers, into a
plaza walk way. The main traffic road has been
diverted through the nearby, Terminus Street.
A$500 million plan to add 60,000 square
metres to the Castle Towers Shopping District is
currently being tabled by The Hills Shire Council
and, if approved, Castle Towers will become the
largest shopping centre in New South Wales,
with a total of 170,000 square metres of active
floorspace.Castle Hill is a mix of low- to medium-density housing, with exception to a
few apartment complexes. In 2005 year under
the NSW Housing Strategy Hume Avenue was
rezoned to medium density, to allow for low rise
unit, and town house developments.