The size of Babbage Island is approximately 3.0 square kilometres. It has 2 parks covering nearly 4.8% of total area. The population of Babbage Island in 2016 was 23 people. By 2021 the population was 17 showing a population decline of 26.1% in the area during that time. The predominant age group in Babbage Island is 50-59 years. Households in Babbage Island are primarily childless couples and are likely to be repaying $600 - $799 per month on mortgage repayments. In general, people in Babbage Island work in a machinery operators and drivers occupation.In 2021, 23.10% of the homes in Babbage Island were owner-occupied compared with 100.00% in 2016.
Babbage Island has 25 properties. As at 30 November 2025:
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