Home Postcode finder QLD Happy Valley Happy Valley postcode QLD Happy Valley is a locality in Queensland covered by postcode 4825. Postcode 4825 State or territory Queensland (QLD) Region North QLD Add a free Happy Valley business listing Be the first listing in Happy Valley Common questionsWhat is the postcode for Happy Valley?Happy Valley, QLD has the postcode 4825.What state is Happy Valley in?Happy Valley is in Queensland (QLD).Does postcode 4825 cover more than one suburb?Yes. Postcode 4825 covers 36 localities, so the postcode alone does not identify Happy Valley. It also appears in 2 states or territories, so it does not identify a state either. Browse other postcodes in Queensland, or widen the search to every Australian postcode.