The size of Marian is approximately 82.9 square kilometres. It has 1 park. The population of Marian in 2011 was 3,019 people. By 2016 the population was 3,904 showing a population growth of 29.3% in the area during that time. The predominant age group in Marian is 0-9 years. Households in Marian are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Marian work in a trades occupation. In 2011, 79.1% of the homes in Marian were owner-occupied compared with 74.6% in 2016. Currently the median sales price of houses in the area is $462,500.