The most recent Australian Bureau of Statistics (ABS) is the 2016 Census.
When compared to earlier census data, the 2011 figures show population increases in the Sydney LGA up 8.2 per cent over the last five years.
The 2016 Census shows an increase in the Sydney LGA of almost 5%.
The 2016 Estimated Resident Population for Darlinghurst is 12,202 with a population density of 140.97 persons per hectare.
You can access the ABS 2016 profiles for your suburb at www.abs.com.au by selecting the census tab.
Statistical Information including some mapping is available across the entire Sydney Local Government area. This information can be found by an ABS Search at http://atlas.id.com.au/sydney
City of Sydney's also hosts LGA profiles.
City of Sydney Community Atlas - http://atlas.id.com.au/Default.aspx?id=148&pg=2005
City of Sydney Community Profile - http://profile.id.com.au/Default.aspx?id=148
Note: census has a number of changes in how it reports information, so data is not easily comparable between censuses. For example, Potts Point splits along Macleay Street so one side is in Potts Point, while the other side is in Elizabeth Bay.
These problems are addressed when the data is further crunched to produce community profiles comparing the various census years.
Used by its traditional owners, the Gadigal people, well into the 1840s, Darlinghurst was a quarry and windmill site before it became popular for the fine villas of the colony's well-to-do, in the 1830s. Subsequent booms and busts raised and lowered the suburb's fortunes, creating the mix of poor and posh, criminal and respectable that have made Darlinghurst one of Sydney's most interesting localities.
See: Dictionary of Sydney at https://dictionaryofsydney.org/place/darlinghurst