As at the 2016 census, the Municipality had an estimated population of 13,199. At 5.7 square kilometres (2.2 sq mi), the Municipality is, by area, the smallest local government area in New South Wales and its boundaries remain mostly unaltered since its proclamation in 1861. A 2015 review of local government boundaries by the NSW Government Independent Pricing and Regulatory Tribunal recommended that the Municipality of Hunter's Hill merge with adjoining councils. The government proposed a merger of the Hunter's Hill, Lane Cove and Ryde Councils to form a new council with an area of 57 square kilometres (22 sq mi) and support a population of approximately 164,000. In July 2017, the Berejiklian government decided to abandon the forced merger of the Hunter's Hill, Lane Cove and Ryde local government areas along with several other proposed forced mergers.
Suburbs and localities in the Municipality of Hunters Hill are:
At the 2016 census there were 13,199 people resident in the Hunter's Hill local government area, of these 49.9 per cent were male and 50.1 per cent were female. Aboriginal and Torres Strait Islander people made up 0.6 per cent of the population; significantly below the NSW and Australian averages of 2.9 and 2.8 per cent respectively. The median age of people in the Municipality of Hunter's Hill was 43 years; significantly higher than the national median of 38 years. Children aged 0 – 14 years made up 19.0 per cent of the population and people aged 65 years and over made up 21.6 per cent of the population. Of people in the area aged 15 years and over, 52.7 per cent were married and 9.3 per cent were either divorced or separated.
Population growth in the Municipality of Hunter's Hill between the 2001 census and the 2006 census was 5.34 per cent and in the subsequent five years to the 2011 census, population decreased by 0.20 per cent. At the 2016 census, the population in the Municipality decreased by 0.12 per cent. When compared with total population growth of Australia for the same period, being 8.8 per cent, population growth in the Hunter's Hill local government area was significantly lower than the national average. The median weekly income for residents within the Municipality of Hunter's Hill was significantly higher than the national average.
Hunters Hill Municipal Council is composed of seven Councillors, including the Mayor, for a fixed four-year term of office. The Mayor is directly elected while the six other Councillors are elected proportionally as two separate wards, each electing three Councillors. The most recent election was held on 9 September 2017, and the makeup of the Council is as follows:
The current Council, elected in 2012, in order of election by ward, is: