The size of Reservoir is approximately 18.9 square kilometres. It has 45 parks covering nearly 7.9% of total area. The population of Reservoir in 2011 was 47,636 people. By 2016 the population was 50,455 showing a population growth of 5.9% in the area during that time. The predominant age group in Reservoir is 30-39 years. Households in Reservoir are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Reservoir work in a professional occupation. In 2011, 62.5% of the homes in Reservoir were owner-occupied compared with 59.3% in 2016. Currently the median sales price of houses in the area is $945,000.