Historically, NSW Schools sport was under the banner of the PSAAA ( Public schools Amateur Athletic Association). This body traditionally governed Primary school activities and those of the super primaries – 3rd class (Year 3) to the Intermediate Certificate – 3rd form (Year 9)

The few full high schools which existed (about 9 in Sydney) and those in the leading country areas formed their own association, namely the NSW Combined High Schools Amateur Athletics Association. As the Sydney metropolitan area grew the need for more full high schools saw the CHS expand and the metropolitan area/region divided into geographical zones, one of which was the Eastern Suburbs Zone.

With the advent of the Wyndham report in the early 1960s, the old Intermediate and Junior High schools became full high schools with the addition of a 6th form (Year 12) and the Higher School Certificate. This created the need to reconsider the zoning system and the creation of the Phillip Zone. The name and emblem was agreed upon at the inaugural meeting of the principals and sportsmasters at the Randwick Rugby Club.

The foundation member schools were Randwick Boys HS, Sydney Boys HS, Maroubra Bay HS, Matraville HS, JJ Cahill HS, South Sydney HS, Vaucluse HS, Dover Heights HS and Cleveland Street HS. The Phillip Zone became very successful and contributed strongly to the CHS representative teams, particularly in rugby union, swimming and cricket.
The Phillip Zone reverted back to its original name Eastern Suburbs in the 1990’s. The Eastern Suburbs Zone Schools currently are: Alexandria Park Community School, Cleveland Street Intensive English HS,The Conservatorium HS,JJ Cahill HS, Matraville Sports HS, Randwick Girls HS, Rose Bay Secondary College, South Sydney HS, Sydney Boys HS and Sydney Girls HS.