The size of Wallarah is approximately 7.5 square kilometres. The population of Wallarah in 2011 was 419 people. By 2016 the population was 361 showing a population decline of 13.8% in the area during that time. The predominant age group in Wallarah is 10-19 years. Households in Wallarah are primarily couples with children and are likely to be repaying $800 - $999 per month on mortgage repayments. In general, people in Wallarah work in a trades occupation. In 2011, 75.8% of the homes in Wallarah were owner-occupied compared with 72.1% in 2016. Currently the median sales price of houses in the area is $1,412,500.