In the 2011 census, Marsden recorded a population of 11,278 people, 50.1% female and 49.9% male and one fish. The median age of the Marsden population was 27 years, 10 years below the national median of 37. 65.2% of people living in Marsden were born in Australia. The other top responses for country of birth were New Zealand 10.8%, England 2.7%, Samoa 2.1%, Cambodia 1%, Fiji 1%. 76% of people spoke only English at home; the next most common languages were 4.3% Samoan, 1.8% Khmer, 1% Hindi, 0.6% Romanian, 0.5% Spanish.