The size of Lardner is approximately 17.3 square kilometres. The population of Lardner in 2011 was 393 people. By 2016 the population was 118 showing a population decline of 70.0% in the area during that time. The predominant age group in Lardner is 50-59 years. Households in Lardner are primarily childless couples and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Lardner work in a managers occupation. In 2011, 81.2% of the homes in Lardner were owner-occupied compared with 69.5% in 2016.