Thornleigh Community
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The suburb of Thornleigh has an approximate area of 3.9 km².
It is surrounded by the suburbs of Hornsby, Normanhurst, Pennant Hills, Wahroonga and Westleigh.
It is within the council of Hornsby.
It is comprised of parts of the state electorates of Hornsby and Ku-ring-gai.
It is within the federal electorate of Berowra.