The size of Westmar is approximately 504.1 square kilometres. It has 8 parks covering nearly 6.5% of total area. The population of Westmar in 2011 was 313 people. By 2016 the population was 57 showing a population decline of 81.8% in the area during that time. The predominant age group in Westmar is 0-9 years. Households in Westmar are primarily childless couples and are likely to be repaying not stated per month on mortgage repayments. In general, people in Westmar work in a managers occupation. In 2011, 47.4% of the homes in Westmar were owner-occupied compared with 38.1% in 2016.