The size of New Lambton is approximately 5.5 square kilometres. It has 17 parks covering nearly 33.7% of total area. The population of New Lambton in 2011 was 9,758 people. By 2016 the population was 10,052 showing a population growth of 3.0% in the area during that time. The predominant age group in New Lambton is 40-49 years. Households in New Lambton are primarily couples with children and are likely to be repaying $1800 - $2399 per month on mortgage repayments. In general, people in New Lambton work in a professional occupation. In 2011, 68.7% of the homes in New Lambton were owner-occupied compared with 68.1% in 2016. Currently the median sales price of houses in the area is $920,000.