The size of Terowie is approximately 169.4 square kilometres. The population of Terowie in 2011 was 231 people. By 2016 the population was 127 showing a population decline of 45.0% in the area during that time. The predominant age group in Terowie is 50-59 years. Households in Terowie are primarily childless couples and are likely to be repaying $600 - $799 per month on mortgage repayments. In general, people in Terowie work in a community and personal service occupation. In 2011, 79.4% of the homes in Terowie were owner-occupied compared with 75% in 2016. Currently the median sales price of houses in the area is $36,500.