Nelson, New South WalesNelson is a suburb of Sydney, in the state of New South Wales, Australia, 42 kilometres north-west of the Sydney central business district in the local government area of The Hills Shire. It is part of the Hills District.PopulationIn the 2021 Australian Census, the population of the suburb of Nelson was approximately 460 people. The gender distribution was close to balanced, with males making up about 50.5% and females about 49.5% of the total population. The median age of residents was 47 years.