The size of Mitchells Flat is approximately 34.8 square kilometres. The population of Mitchells Flat in 2011 was 305 people. By 2016 the population was 213 showing a population decline of 30.2% in the area during that time. The predominant age group in Mitchells Flat is 40-49 years. Households in Mitchells Flat are primarily couples with children and are likely to be repaying $3000 - $3999 per month on mortgage repayments. In general, people in Mitchells Flat work in a trades occupation. In 2011, 84.2% of the homes in Mitchells Flat were owner-occupied compared with 83.6% in 2016.