The size of Boulder is approximately 4.3 square kilometres. It has 2 parks covering nearly 3.5% of total area. The population of Boulder in 2011 was 5,358 people. By 2016 the population was 4,815 showing a population decline of 10.1% in the area during that time. The predominant age group in Boulder is 0-9 years. Households in Boulder are primarily couples with children and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Boulder work in a machinery operators and drivers occupation. In 2011, 61.2% of the homes in Boulder were owner-occupied compared with 60.4% in 2016. Currently the median sales price of houses in the area is $235,000.