The statistical area of Inangahua, which covers 3,196 square kilometres and surrounds but does not include Reefton, had a population of 864 at the 2018 New Zealand census, a decrease of 147 people (-14.5%) since the 2013 census, and a decrease of 117 people (-11.9%) since the 2006 census. There were 402 households. There were 468 males and 396 females, giving a sex ratio of 1.18 males per female. The median age was 42.6 years (compared with 37.4 years nationally), with 162 people (18.8%) aged under 15 years, 150 (17.4%) aged 15 to 29, 426 (49.3%) aged 30 to 64, and 123 (14.2%) aged 65 or older.