The size of Broadmarsh is approximately 87.3 square kilometres. It has 11 parks covering nearly 28.4% of total area. The population of Broadmarsh in 2011 was 379 people. By 2016 the population was 152 showing a population decline of 59.9% in the area during that time. The predominant age group in Broadmarsh is 40-49 years. Households in Broadmarsh are primarily couples with children and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Broadmarsh work in a managers occupation. In 2011, 86.1% of the homes in Broadmarsh were owner-occupied compared with 91.1% in 2016.