Mackenzie District had a population of 4,866 at the 2018 New Zealand census, an increase of 708 people (17.0%) since the 2013 census, and an increase of 1,065 people (28.0%) since the 2006 census. There were 1,863 households. There were 2,511 males and 2,352 females, giving a sex ratio of 1.07 males per female. Of the total population, 801 people (16.5%) were aged up to 15 years, 978 (20.1%) were 15 to 29, 2,274 (46.7%) were 30 to 64, and 810 (16.6%) were 65 or older.