 In the 2011 census, Northgate recorded a population of 4,304 people; 49.7% female and 50.3% male.The median age of the Northgate population was 34 years of age, 3 years below the Australian median.Children under 15 years made up 16.9% of the population and people aged 65 years and over made up 9.6% of the population.