The size of Marlbed is approximately 116.9 square kilometres. The population of Marlbed in 2006 was 823 people. By 2011 the population was 320 showing a population decline of 61.1% in the area during that time. The predominant age group in Marlbed is 10-19 years. Households in Marlbed are primarily couples with children and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Marlbed work in a managers occupation. In 2006, 80.1% of the homes in Marlbed were owner-occupied compared with 79.5% in 2011.