Lepperton-Brixton had a population of 1,725 at the 2018 New Zealand census, an increase of 201 people (13.2%) since the 2013 census, and an increase of 429 people (33.1%) since the 2006 census. There were 615 households. There were 879 males and 846 females, giving a sex ratio of 1.04 males per female. The median age was 40.8 years (compared with 37.4 years nationally), with 402 people (23.3%) aged under 15 years, 216 (12.5%) aged 15 to 29, 870 (50.4%) aged 30 to 64, and 237 (13.7%) aged 65 or older.