The size of Wall Flat is approximately 16.2 square kilometres. The population of Wall Flat in 2011 was 271 people. By 2016 the population was 53 showing a population decline of 80.4% in the area during that time. The predominant age group in Wall Flat is 50-59 years. Households in Wall Flat are primarily childless couples and are likely to be repaying $800 - $999 per month on mortgage repayments. In general, people in Wall Flat work in a managers occupation. In 2011, 83.2% of the homes in Wall Flat were owner-occupied compared with 65.4% in 2016.