In 1907 Karangahake had a population of 3,000. Karangahake is described by Statistics New Zealand as a rural settlement. It covers and had an estimated population of as of with a population density of people per km2. It is part of the larger
Paeroa Rural statistical area. Karangahake had a population of 381 in the
2023 New Zealand census, an increase of 60 people (18.7%) since the
2018 census, and an increase of 84 people (28.3%) since the
2013 census. There were 192 males and 189 females in 147 dwellings. 2.4% of people identified as
LGBTIQ+. The median age was 51.9 years (compared with 38.1 years nationally). There were 69 people (18.1%) aged under 15 years, 24 (6.3%) aged 15 to 29, 189 (49.6%) aged 30 to 64, and 99 (26.0%) aged 65 or older. ==Education==