The size of Langwarrin is approximately 28.8 square kilometres. It has 42 parks covering nearly 14.4% of total area. The population of Langwarrin in 2011 was 21,370 people. By 2016 the population was 22,580 showing a population growth of 5.7% in the area during that time. The predominant age group in Langwarrin is 40-49 years. Households in Langwarrin are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Langwarrin work in a trades occupation. In 2011, 80% of the homes in Langwarrin were owner-occupied compared with 78.3% in 2016. Currently the median sales price of houses in the area is $825,000.