The size of Watsonia is approximately 2.3 square kilometres. It has 7 parks covering nearly 7.9% of total area. The population of Watsonia in 2011 was 5,145 people. By 2016 the population was 5,228 showing a population growth of 1.6% in the area during that time. The predominant age group in Watsonia is 30-39 years. Households in Watsonia are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Watsonia work in a professional occupation. In 2011, 71% of the homes in Watsonia were owner-occupied compared with 67.9% in 2016. Currently the median sales price of houses in the area is $985,250.