The size of Clontarf is approximately 9.9 square kilometres. It has 22 parks covering nearly 17.2% of total area. The population of Clontarf in 2011 was 7,909 people. By 2016 the population was 8,291 showing a population growth of 4.8% in the area during that time. The predominant age group in Clontarf is 40-49 years. Households in Clontarf are primarily childless couples and are likely to be repaying $1800 – $2399 per month on mortgage repayments. In general, people in Clontarf work in a trades occupation. In 2011, 62.5% of the homes in Clontarf were owner-occupied compared with 62.3% in 2016.