The size of Seacliff is approximately 0.9 square kilometres. It has 6 parks covering nearly 6% of total area. The population of Seacliff in 2011 was 1,954 people. By 2016 the population was 1,955 showing a population growth of 0.1% in the area during that time. The predominant age group in Seacliff is 50-59 years. Households in Seacliff are primarily childless couples and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in Seacliff work in a professional occupation. In 2011, 69.6% of the homes in Seacliff were owner-occupied compared with 70.9% in 2016. Currently the median sales price of houses in the area is $1,000,000.