The size of Koondrook is approximately 59.2 square kilometres. It has 9 parks covering nearly 0.9% of total area. The population of Koondrook in 2011 was 1,094 people. By 2016 the population was 995 showing a population decline of 9.0% in the area during that time. The predominant age group in Koondrook is 60-69 years. Households in Koondrook are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Koondrook work in a labourer occupation. In 2011, 79.2% of the homes in Koondrook were owner-occupied compared with 77.3% in 2016. Currently the median sales price of houses in the area is $290,000.