The size of Mernda is approximately 22.5 square kilometres. It has 35 parks covering nearly 2% of total area. The population of Mernda in 2011 was 6,507 people. By 2016 the population was 16,469 showing a population growth of 153.1% in the area during that time. The predominant age group in Mernda is 30-39 years. Households in Mernda are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Mernda work in a professional occupation. In 2011, 79.8% of the homes in Mernda were owner-occupied compared with 69.9% in 2016. Currently the median sales price of houses in the area is $680,000.