Tuakau, comprising the statistical areas of Tuakau North and Tuakau South, had a population of 5,013 at the 2018 New Zealand census, an increase of 741 people (17.3%) since the 2013 census, and an increase of 1,404 people (38.9%) since the 2006 census. There were 1,632 households. There were 2,457 males and 2,559 females, giving a sex ratio of 0.96 males per female, with 1,293 people (25.8%) aged under 15 years, 1,041 (20.8%) aged 15 to 29, 2,094 (41.8%) aged 30 to 64, and 582 (11.6%) aged 65 or older.