The size of Colly Blue is approximately 42.9 square kilometres. The population of Colly Blue in 2016 was 31 people. By 2021 the population was 22 showing a population decline of 29.0% in the area during that time. The predominant age group in Colly Blue is 10-19 years. Households in Colly Blue are primarily couples with children and are likely to be repaying $2400 - $2999 per month on mortgage repayments. In general, people in Colly Blue work in a machinery operators and drivers occupation.In 2021, 142.90% of the homes in Colly Blue were owner-occupied compared with 72.80% in 2016.
Colly Blue has 18 properties. As at 31 January 2026:
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