This Enrolment Scheme complies with the purposes (as set out in Schedule 20) and principles governing content and implementation of enrolment schemes (as set out in Section 3) of the Education and Training Act 2020, and updated 2020. Enrolment at Onehunga High School shall be determined in accordance with the following priorities.

The area described below shall be the Home Zone within which domestic or exempt students residing shall be entitled to enrol at Onehunga High School.

1. ​On the northern side of the Manukau Harbour the boundary runs from Hillsborough Cemetery via Hillsborough Road (including both sides of Hillsborough Road), St Andrews Road to Selwyn Road, Pah Road and Ngaroma Road (included in each case) to One Tree Hill Domain; from the Domain across Campbell Road at its intersection with Moana Avenue – then via Moana Road, Namata Road, Curzon Street, Mays Road and Captain Springs Road (included in each case) to the Manukau Harbour.
2. ​South of the Manukau Harbour the boundary follows a line south of Ambury Road, Taylor Road, Domain Road and Hastie Avenue so that both sides of these streets, and the no exit streets leading off them, are included in the Onehunga High School enrolment area.

• First Priority: This priority category is not applicable at this school because the school does not run a special programme approved by the Secretary.
• Second Priority: Will be given to applicants who are siblings of current students.
• Third Priority: Will be given to applicants who are siblings of former students.
• Fourth Priority: Will be given to applicants who are children of a former student of the school
• Fifth Priority: Will be given to any applicant who is either a child of an employee of the board of the school or a child of a member of the board of the school
• Sixth Priority: Will be given to all other applicants.

If there are more applicants in the second, third, fourth, fifth or sixth priority groups than there are places available, selection within the priority group will be by a ballot conducted in accordance with instructions issued by the Secretary under Schedule 20 of the Education and Training Act 2020. Parents will be informed of the date of any ballot by notice in mediums appropriate to the area served by the school, including the school's website and a daily or community news publication.

Out of Zone applications for 2024 closed on Wednesday 4 September 2024 and the ballot was held on 11 September 2024. 

Onehunga High School will hold a ballot annually to determine which Out of Zone students can be given the right to enrol for the following year. The ballot will be supervised by a practising lawyer.