Hauraki had a population of 4,131 at the 2018 New Zealand census, an increase of 162 people (4.1%) since the 2013 census, and an increase of 339 people (8.9%) since the 2006 census. There were 1,434 households. There were 1,998 males and 2,133 females, giving a sex ratio of 0.94 males per female. The median age was 37 years, with 861 people (20.8%) aged under 15 years, 774 (18.7%) aged 15 to 29, 1,977 (47.9%) aged 30 to 64, and 522 (12.6%) aged 65 or older.