The size of Markwell is approximately 53.3 square kilometres. It has 3 parks covering nearly 19.9% of total area. The population of Markwell in 2011 was 270 people. By 2016 the population was 113 showing a population decline of 58.1% in the area during that time. The predominant age group in Markwell is 50-59 years. Households in Markwell are primarily childless couples and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Markwell work in a managers occupation. In 2011, 79.6% of the homes in Markwell were owner-occupied compared with 60.8% in 2016.