Richmond had a population of 15,279 at the 2018 New Zealand census, an increase of 1,896 people (14.2%) since the 2013 census, and an increase of 2,859 people (23.0%) since the 2006 census. There were 5,739 households. There were 7,338 males and 7,944 females, giving a sex ratio of 0.92 males per female, with 2,805 people (18.4%) aged under 15 years, 2,442 (16.0%) aged 15 to 29, 6,456 (42.3%) aged 30 to 64, and 3,579 (23.4%) aged 65 or older.
