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The 2021 population forecast for Thornleigh is 9,452, and is forecast to grow to 10,649 by 2036.
Thornleigh is bounded by Waitara Creek in the north, the suburb of Normanhurst and the Lane Cove River in the east, the suburb of Pennant Hills in the south and Quarter Sessions Road, Duffy Avenue and the suburb of Westleigh in the west.
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