The size of Dalkey is approximately 11.3 square kilometres. The population of Dalkey in 2011 was 274 people. By 2016 the population was 4 showing a population decline of 98.5% in the area during that time. The predominant age group in Dalkey is 0-9 years. Households in Dalkey are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Dalkey work in a managers occupation. In 2006, 94% of the homes in Dalkey were owner-occupied compared with 77.7% in 2011.