The size of Sumner is approximately 1.9 square kilometres. It has 4 parks covering nearly 15.1% of total area. The population of Sumner in 2011 was 540 people. By 2016 the population was 600 showing a population growth of 11.1% in the area during that time. The predominant age group in Sumner is 30-39 years. Households in Sumner are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Sumner work in a professional occupation. In 2011, 59.3% of the homes in Sumner were owner-occupied compared with 61.6% in 2016. Currently the median sales price of houses in the area is $572,500.