The size of Yallunda Flat is approximately 226.2 square kilometres. The population of Yallunda Flat in 2011 was 1,826 people. By 2016 the population was 84 showing a population decline of 95.4% in the area during that time. The predominant age group in Yallunda Flat is 60-69 years. Households in Yallunda Flat are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Yallunda Flat work in a managers occupation. In 2011, 69.6% of the homes in Yallunda Flat were owner-occupied compared with 79.3% in 2016.