The size of Tarwin Lower is approximately 206.4 square kilometres. It has 1 park covering nearly 0.4% of total area. The population of Tarwin Lower in 2011 was 360 people. By 2016 the population was 374 showing a population growth of 3.9% in the area during that time. The predominant age group in Tarwin Lower is 60-69 years. Households in Tarwin Lower are primarily childless couples and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Tarwin Lower work in a managers occupation. In 2011, 73.8% of the homes in Tarwin Lower were owner-occupied compared with 81.7% in 2016. Currently the median sales price of houses in the area is $900,000.