The size of Warnbro is approximately 11.7 square kilometres. It has 12 parks covering nearly 3.1% of total area. The population of Warnbro in 2011 was 11,101 people. By 2016 the population was 10,772 showing a population decline of 3.0% in the area during that time. The predominant age group in Warnbro is 50-59 years. Households in Warnbro are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Warnbro work in a trades occupation. In 2011, 66.3% of the homes in Warnbro were owner-occupied compared with 70% in 2016. Currently the median sales price of houses in the area is $368,500.