DemographicsHeadington Hill is approximately 45.92 square kilometres. In 2016 the population of Headington Hill was 58. The population is 57% male and 43% female. On average the monthly mortgage repayments in Headington Hill are $0 to $299. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $275 to $349.