The size of Sleaford is approximately 189 square kilometres. It has 4 parks covering nearly 16.4% of total area. The population of Sleaford in 2011 was 171 people. By 2016 the population was 35 showing a population decline of 79.5% in the area during that time. The predominant age group in Sleaford is 50-59 years. Households in Sleaford are primarily couples with children and are likely to be repaying $600 - $799 per month on mortgage repayments. In general, people in Sleaford work in a managers occupation. In 2011, 71.5% of the homes in Sleaford were owner-occupied compared with 60% in 2016.