The size of Lock is approximately 637 square kilometres. It has 4 parks covering nearly 0.1% of total area. The population of Lock in 2011 was 435 people. By 2016 the population was 266 showing a population decline of 38.9% in the area during that time. The predominant age group in Lock is 50-59 years. Households in Lock are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Lock work in a managers occupation. In 2011, 69.3% of the homes in Lock were owner-occupied compared with 83.2% in 2016. Currently the median sales price of houses in the area is $58,000.