The size of Nepean Bay is approximately 44.7 square kilometres. It has 1 park covering nearly 0.8% of total area. The population of Nepean Bay in 2016 was 131 people. By 2021 the population was 140 showing a population growth of 6.9% in the area during that time. The predominant age group in Nepean Bay is 60-69 years. Households in Nepean Bay are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Nepean Bay work in a managers occupation.In 2021, 80.00% of the homes in Nepean Bay were owner-occupied compared with 87.70% in 2016.
Nepean Bay has 298 properties. Over the last 5 years, Houses in Nepean Bay have seen a 80.50% increase in median value. As at 31 October 2025:
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