The size of Wilpinjong is approximately 51.9 square kilometres. It has 2 parks covering nearly 19.6% of total area. The population of Wilpinjong in 2006 was 307 people. By 2011 the population was 262 showing a population decline of 14.7% in the area during that time. The predominant age group in Wilpinjong is 40-49 years. Households in Wilpinjong are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Wilpinjong work in a managers occupation. In 2006, 78.8% of the homes in Wilpinjong were owner-occupied compared with 67.8% in 2011.