South Waikato District had a population of 24,042 at the 2018 New Zealand census, an increase of 1,971 people (8.9%) since the 2013 census, and an increase of 1,401 people (6.2%) since the 2006 census. There were 8,511 households. There were 11,982 males and 12,060 females, giving a sex ratio of 0.99 males per female. Of the total population, 5,526 people (23.0%) were aged up to 15 years, 4,479 (18.6%) were 15 to 29, 10,077 (41.9%) were 30 to 64, and 3,963 (16.5%) were 65 or older. Figures may not add up to the total due to rounding.