The size of Pennyroyal is approximately 30.1 square kilometres. The population of Pennyroyal in 2011 was 372 people. By 2016 the population was 70 showing a population decline of 81.2% in the area during that time. The predominant age group in Pennyroyal is 50-59 years. Households in Pennyroyal are primarily childless couples and are likely to be repaying $2400 - $2999 per month on mortgage repayments. In general, people in Pennyroyal work in a managers occupation. In 2011, 82.3% of the homes in Pennyroyal were owner-occupied compared with 72.8% in 2016.