Kaiapoi High School serves the coastal Waimakariri District, including the towns of Kaiapoi,
Woodend,
Pegasus,
Waikuku, and the surrounding rural area west to
Swannanoa. It also serves the rural northeastern part of Christchurch City as far south as the Styx River, including Kainga, Brooklands, Spencerville. At the April 2014 Education Review Office (ERO) review of the school, Kaiapoi High School had 587 students, including 24
international students. There were slightly more male students (51%) than female students. 79% of students identified as
New Zealand European (Pākehā), 14% identified as
Māori, and 7% identified as another ethnicity. As of , Kaiapoi High School has roll of students, of which (%) identify as Māori. As of , the school has an
Equity Index of , placing it amongst schools whose students have socioeconomic barriers to achievement (roughly equivalent to deciles 5 and 6 under the former
socio-economic decile system). ==Karanga Mai Young Parents' College==