The size of Marlo is approximately 134.4 square kilometres. It has 4 parks covering nearly 17.2% of total area. The population of Marlo in 2011 was 678 people. By 2016 the population was 551 showing a population decline of 18.7% in the area during that time. The predominant age group in Marlo is 50-59 years. Households in Marlo are primarily childless couples and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Marlo work in a professional occupation. In 2011, 78.1% of the homes in Marlo were owner-occupied compared with 82.2% in 2016. Currently the median sales price of houses in the area is $482,500.