The Whangamomona statistical area, which covers , had a population of 126 at the 2018 New Zealand census, a decrease of 24 people (-16.0%) since the 2013 census, and a decrease of 42 people (-25.0%) since the 2006 census. There were 54 households. There were 72 males and 54 females, giving a sex ratio of 1.33 males per female. The median age was 49.7 years (compared with 37.4 years nationally), with 21 people (16.7%) aged under 15 years, 12 (9.5%) aged 15 to 29, 78 (61.9%) aged 30 to 64, and 18 (14.3%) aged 65 or older.