Trentham, comprising the statistical areas of Poets Block, Brentwood, Trentham North and Trentham South, covers . It had an estimated population of as of with a population density of people per km2. Trentham had a population of 10,956 in the
2023 New Zealand census, an increase of 1,353 people (14.1%) since the
2018 census, and an increase of 2,427 people (28.5%) since the
2013 census. There were 5,544 males, 5,355 females, and 54 people of
other genders in 4,059 dwellings. 3.5% of people identified as
LGBTIQ+. The median age was 37.7 years (compared with 38.1 years nationally). There were 2,022 people (18.5%) aged under 15 years, 1,923 (17.6%) aged 15 to 29, 5,223 (47.7%) aged 30 to 64, and 1,788 (16.3%) aged 65 or older. ==Education==