Home Postcode finder QLD Diamond Valley Diamond Valley postcode QLD Diamond Valley is a locality in Queensland covered by postcode 4553. Postcode 4553 State or territory Queensland (QLD) Region Sunshine Coast Add a free Diamond Valley business listing Be the first listing in Diamond Valley Common questionsWhat is the postcode for Diamond Valley?Diamond Valley, QLD has the postcode 4553.What state is Diamond Valley in?Diamond Valley is in Queensland (QLD).Does postcode 4553 cover more than one suburb?Yes. Postcode 4553 covers 5 localities, so the postcode alone does not identify Diamond Valley. Browse other postcodes in Queensland, or widen the search to every Australian postcode.