The size of Treeby is approximately 8.3 square kilometres. It has 2 parks covering nearly 0.9% of total area. The population of Treeby in 2011 was 1,399 people. By 2016 the population was 2,087 showing a population growth of 49.2% in the area during that time. The predominant age group in Treeby is 20-29 years. Households in Treeby are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Treeby work in a professional occupation. In 2011, 90.4% of the homes in Treeby were owner-occupied compared with 81.6% in 2016. Currently the median sales price of houses in the area is $557,500.