DemographicsHappy Valley (Swan Hill - Vic.) is approximately 46.48 square kilometres. In 2016 the population of Happy Valley (Swan Hill - Vic.) was 81. The population is 58% male and 42% female. On average the monthly mortgage repayments in Happy Valley (Swan Hill - Vic.) are $0 to $299. The most common weekly income bracket is $400 to $499 per week. Weekly rents in the area are on average $0 to $74.