The size of Northdown is approximately 21.4 square kilometres. It has 1 park. The population of Northdown in 2016 was 221 people. By 2021 the population was 265 showing a population growth of 19.9% in the area during that time. The predominant age group in Northdown is 50-59 years. Households in Northdown are primarily childless couples and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Northdown work in a managers occupation.In 2021, 78.10% of the homes in Northdown were owner-occupied compared with 98.60% in 2016.
Northdown has 146 properties. Over the last 5 years, Houses in Northdown have seen a 74.37% increase in median value. As at 31 October 2025:
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