The size of Killingworth is approximately 23.5 square kilometres. It has 4 parks covering nearly 69.2% of total area. The population of Killingworth in 2016 was 679 people. By 2021 the population was 690 showing a population growth of 1.6% in the area during that time. The predominant age group in Killingworth is 60-69 years. Households in Killingworth are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Killingworth work in a trades occupation.In 2021, 92.30% of the homes in Killingworth were owner-occupied compared with 91.70% in 2016.
Killingworth has 349 properties. Over the last 5 years, Houses in Killingworth have seen a 94.28% increase in median value. As at 31 October 2025:
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