Rotoiti is described by Statistics New Zealand as a rural settlement, and covers and had an estimated population of as of with a population density of people per km2. Rotoiti is part of the larger
Rotoiti-Rotoehu statistical area. Rotoiti had a population of 501 in the
2023 New Zealand census, an increase of 3 people (0.6%) since the
2018 census, and an increase of 93 people (22.8%) since the
2013 census. There were 237 males and 261 females in 162 dwellings. 0.6% of people identified as
LGBTIQ+. The median age was 41.5 years (compared with 38.1 years nationally). There were 102 people (20.4%) aged under 15 years, 90 (18.0%) aged 15 to 29, 219 (43.7%) aged 30 to 64, and 93 (18.6%) aged 65 or older. ==Marae==