DemographicsLlangothlin is approximately 134.07 square kilometres. In 2016 the population of Llangothlin was 129. The population is 54% male and 46% female. On average the monthly mortgage repayments in Llangothlin are $1000 to $1399. The most common weekly income bracket is $500 to $649 per week. Weekly rents in the area are on average $0 to $74.