DemographicsMollongghip is approximately 22.63 square kilometres. In 2016 the population of Mollongghip was 89. The population is 49% male and 51% female. On average the monthly mortgage repayments in Mollongghip are $0 to $299. The most common weekly income bracket is $800 to $999 per week. Weekly rents in the area are on average $0 to $74.