The size of Billywillinga is approximately 51.9 square kilometres. The population of Billywillinga in 2016 was 194 people. By 2021 the population was 196 showing a population growth of 1.0% in the area during that time. The predominant age group in Billywillinga is 50-59 years. Households in Billywillinga are primarily childless couples and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Billywillinga work in a trades occupation.In 2021, 98.50% of the homes in Billywillinga were owner-occupied compared with 92.10% in 2016.
Billywillinga has 92 properties. Over the last 5 years, Houses in Billywillinga have seen a 29.10% increase in median value. As at 30 November 2025:
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