DemographicsAvon Plains is approximately 62.3 square kilometres. In 2016 the population of Avon Plains was 7. The population is 100% male and 0% female. On average the monthly mortgage repayments in Avon Plains are $0 to $299. The most common weekly income bracket is $300 to $399 per week. Weekly rents in the area are on average $0 to $74.