DemographicsNewfield is approximately 25.56 square kilometres. In 2016 the population of Newfield was 69. The population is 59% male and 41% female. On average the monthly mortgage repayments in Newfield are $1000 to $1399. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $0 to $74.