DemographicsLangdons Hill is approximately 11.89 square kilometres. In 2016 the population of Langdons Hill was 21. The population is 41% male and 59% female. On average the monthly mortgage repayments in Langdons Hill are $0 to $299. The most common weekly income bracket is $400 to $499 per week. Weekly rents in the area are on average $0 to $74.