The size of Jerramungup is approximately 1,072.3 square kilometres. It has 2 parks covering nearly 24.1% of total area. The population of Jerramungup in 2011 was 482 people. By 2016 the population was 354 showing a population decline of 26.6% in the area during that time. The predominant age group in Jerramungup is 30-39 years. Households in Jerramungup are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Jerramungup work in a managers occupation. In 2011, 60% of the homes in Jerramungup were owner-occupied compared with 53.5% in 2016. Currently the median sales price of houses in the area is $177,500.