The size of Leslie Vale is approximately 13.1 square kilometres. It has 5 parks covering nearly 1.4% of total area. The population of Leslie Vale in 2011 was 366 people. By 2016 the population was 337 showing a population decline of 7.9% in the area during that time. The predominant age group in Leslie Vale is 50-59 years. Households in Leslie Vale are primarily couples with children. In general, people in Leslie Vale work in a professional occupation. In 2011, 88.7% of the homes in Leslie Vale were owner-occupied compared with 82.3% in 2016. Currently the median sales price of houses in the area is $640,000.