Birkenhead, comprising the statistical areas of Birkenhead West, Birkenhead North and Birkenhead South, had a population of 10,536 at the 2018 New Zealand census, an increase of 894 people (9.3%) since the 2013 census, and an increase of 1,230 people (13.2%) since the 2006 census. There were 3,780 households. There were 5,022 males and 5,514 females, giving a sex ratio of 0.91 males per female, with 1,836 people (17.4%) aged under 15 years, 2,037 (19.3%) aged 15 to 29, 5,010 (47.6%) aged 30 to 64, and 1,653 (15.7%) aged 65 or older.